*misc

18 files changed, 682 insertions, 253 deletions

diff --git a/src/core/clip.c b/src/core/clip.c
index 23e18ce..37aa9d2 100644
--- a/src/core/clip.c
+++ b/src/core/clip.c
@@ -37,13 +37,16 @@ static LinearInterpolator clip_interpolator[REG_TOTAL] = {
 	ssrS_lerpvec4,
 };
 
-uint clip_element_size[REG_TOTAL] = {
-	4,4,4,4, /*float*/
-	8, 8, 8, 8,8, 8, 8, 8, /*Vec2*/
-	12,12,12,12,12,12,12,12,12,12,12,12, /*Vec3*/
-	16,16,16,16,16,16,16,16 /*Vec4*/
+static uint clip_element_size[REG_TOTAL] = {
+	sizeof(float),sizeof(float),sizeof(float),sizeof(float), /*float*/
+	sizeof(Vec2), sizeof(Vec2), sizeof(Vec2), sizeof(Vec2),sizeof(Vec2), sizeof(Vec2), sizeof(Vec2), sizeof(Vec2), /*Vec2*/
+	sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3),sizeof(Vec3), /*Vec3*/
+	sizeof(Vec4),sizeof(Vec4),sizeof(Vec4),sizeof(Vec4),sizeof(Vec4),sizeof(Vec4),sizeof(Vec4),sizeof(Vec4) /*Vec4*/
 };
 
+ClippedBuffer clip_buffer;
+static ClippedBuffer temp_clip_buffer;
+
 /*用来访问临时寄存器*/
 byte* clip_buffer_data[REG_TOTAL] =
 {
@@ -82,7 +85,7 @@ byte* clip_buffer_data[REG_TOTAL] =
 };
 
 /*用来访问临时寄存器*/
-byte* temp_clip_buffer_data[REG_TOTAL] =
+static byte* temp_clip_buffer_data[REG_TOTAL] =
 {
 	temp_clip_buffer.temp_reg_num[0],
 	temp_clip_buffer.temp_reg_num[1],
@@ -198,8 +201,8 @@ static bool clip_against_plane(
 		prev = &src_buffer->vertices[(i - 1 + src_buffer->count) % src_buffer->count];
 		curr = &src_buffer->vertices[i];
 
-		previ = prev->vertex.index;
-		curri = curr->vertex.index;
+		previ = prev->index;
+		curri = curr->index;
 
 		prev_inside = is_inside_plane(&prev->clip_coord, plane);
 		curr_inside = is_inside_plane(&curr->clip_coord, plane);
@@ -208,7 +211,7 @@ static bool clip_against_plane(
 			t = get_intersect_ratio(&prev->clip_coord, &curr->clip_coord, plane);
 			dst = &dst_buffer->vertices[idx];
 			ssrS_lerpvec4(t, &prev->clip_coord, &curr->clip_coord, &dst->clip_coord);
-			dst->vertex.index = idx;
+			dst->index = idx;
 			/*set varying variables*/
 			if (varying) {
 				for (j = 0; j < REG_TOTAL; ++j) {
@@ -224,7 +227,7 @@ static bool clip_against_plane(
 		if (curr_inside) {
 			dst = &dst_buffer->vertices[idx];
 			*dst = *curr;
-			dst->vertex.index = idx;
+			dst->index = idx;
 			/*copy varying variables*/
 			if (varying) {
 				for (j = 0; j < REG_TOTAL; ++j) {
@@ -247,18 +250,15 @@ static bool clip_against_plane(
 		return 1;																		           										 \
 	}
 
-ClippedBuffer clip_buffer;
-ClippedBuffer temp_clip_buffer;
-
 bool clip_triangle(
 	Vec4* c0, Vec4* c1, Vec4* c2
-	, Vert* v0, Vert* v1, Vert* v2
+	, uint i0, uint i1, uint i2
 	, uint varying_flag
 	, ClippedBuffer* buffer
 ) {
 	bool is_visible = is_vertex_visible(c0)
-	&& is_vertex_visible(c1)
-	&& is_vertex_visible(c2);
+		&& is_vertex_visible(c1)
+		&& is_vertex_visible(c2);
 
 	if (is_visible)
 		return 0; /*no need to clip*/
@@ -269,24 +269,22 @@ bool clip_triangle(
 	temp_clip_buffer.count = 3;
 #define COPY_VERT(i) \
 	temp_clip_buffer.vertices[i].clip_coord = *c##i; \
-	temp_clip_buffer.vertices[i].vertex = *v##i;     \
-	temp_clip_buffer.vertices[i].vertex.index = ##i; \
+	temp_clip_buffer.vertices[i].index = ##i; \
 
 	COPY_VERT(0);
 	COPY_VERT(1);
 	COPY_VERT(2);
 
-#undef COPY_VERT
-
 	int i, index, size;
 	for (i = 0; i < REG_TOTAL; ++i) {
 		index = open_regsi[i];
 		if (index == -1) break;
 		size = registers[index].element_size;
-		ssrM_copy(&temp_clip_buffer_data[index][0], &registers[index].data[v0->index*size], size);
-		ssrM_copy(&temp_clip_buffer_data[index][size], &registers[index].data[v1->index*size], size);
-		ssrM_copy(&temp_clip_buffer_data[index][2*size], &registers[index].data[v2->index*size], size);
+		ssrM_copy(&temp_clip_buffer_data[index][0], &registers[index].data[i0*size], size);
+		ssrM_copy(&temp_clip_buffer_data[index][size], &registers[index].data[i1*size], size);
+		ssrM_copy(&temp_clip_buffer_data[index][2*size], &registers[index].data[i2*size], size);
 	}
+#undef COPY_VERT
 
 	CLIP(POSITIVE_W, &temp_clip_buffer, buffer, temp_clip_buffer_data, clip_buffer_data);
 	CLIP(POSITIVE_X, buffer, &temp_clip_buffer, clip_buffer_data, temp_clip_buffer_data);
diff --git a/src/core/clip.h b/src/core/clip.h
index c1bb7b6..076d3ab 100644
--- a/src/core/clip.h
+++ b/src/core/clip.h
@@ -10,15 +10,15 @@
 typedef struct {
 	/*clipping coord*/
 	Vec4 clip_coord;
-	/*vertex data*/
-	Vert vertex; 
+	/*new index*/
+	uint index;
 } ClippedVert;
 
 #define CLIP_BUFFER_SIZE 6
 
 typedef struct {
+	uint count; /*number of resulting vertices*/
 	ClippedVert vertices[CLIP_BUFFER_SIZE];
-	uint count;
 	/*temp register*/
 	float temp_reg_num[REG_NUM_COUNT][CLIP_BUFFER_SIZE];
 	Vec2 temp_reg_v2[REG_V2_COUNT][CLIP_BUFFER_SIZE];
@@ -27,9 +27,8 @@ typedef struct {
 } ClippedBuffer;
 
 ClippedBuffer clip_buffer; /*clipping result*/
-ClippedBuffer temp_clip_buffer; 
 
-bool clip_triangle(Vec4* c0, Vec4* c1, Vec4* c2, Vert* v0, Vert* v1, Vert* v2, uint varying_flag, ClippedBuffer* clipped);
+bool clip_triangle(Vec4* c0, Vec4* c1, Vec4* c2, uint i0, uint i1, uint i2, uint varying_flag, ClippedBuffer* clipped);
 
 uint clip_line();
 
diff --git a/src/core/color.c b/src/core/color.c
index 45ca555..4f1a877 100644
--- a/src/core/color.c
+++ b/src/core/color.c
@@ -1,6 +1,8 @@
 #include "vert.h"
 #include "device.h"
 
+Color32 COLOR32_WHITE = {1,1,1,1};
+
 Color color32_tocolor(Color32* c) {
 	return ssr_color(0xff * c->r, 0xff * c->g, 0xff * c->b, 0xff * c->a);
 }
diff --git a/src/core/depth.c b/src/core/depth.c
new file mode 100644
index 0000000..e2c776b
--- /dev/null
+++ b/src/core/depth.c
@@ -0,0 +1,35 @@
+#include "mem.h"
+#include "depth.h"
+#include "../util/assert.h"
+
+bool depth_always(float src, float dst) {
+	return 1;
+}
+
+bool depth_never(float src, float dst) {
+	return 0;
+}
+
+bool depth_less(float src, float dst) {
+	return src < dst; 
+}
+
+bool depth_equal(float src, float dst) {
+	return src == dst; 
+}
+
+bool depth_leuqal(float src, float dst) {
+	return src <= dst;
+}
+
+bool depth_greater(float src, float dst) {
+	return src > dst; 
+}
+
+bool depth_notequal(float src, float dst) {
+	return src != dst;
+}
+
+bool depth_gequer(float src, float dst) {
+	return src >= dst;
+}
diff --git a/src/core/depth.h b/src/core/depth.h
new file mode 100644
index 0000000..3914055
--- /dev/null
+++ b/src/core/depth.h
@@ -0,0 +1,17 @@
+#ifndef _SOFTSHADEROOM_DEPTH_H_
+#define _SOFTSHADEROOM_DEPTH_H_
+
+#include "../util/type.h"
+
+typedef bool(*DepthFunc)(float src, float dst);
+
+bool depth_always(float src, float dst);
+bool depth_never(float src, float dst);
+bool depth_less(float src, float dst);
+bool depth_equal(float src, float dst);
+bool depth_leuqal(float src, float dst);
+bool depth_greater(float src, float dst);
+bool depth_notequal(float src, float dst);
+bool depth_gequer(float src, float dst);
+
+#endif
\ No newline at end of file
diff --git a/src/core/device.c b/src/core/device.c
index b5468cd..dc4d80e 100644
--- a/src/core/device.c
+++ b/src/core/device.c
@@ -3,93 +3,111 @@
 #include "clip.h"
 #include "shader.h"
 #include "../util/assert.h"
+#include "framebuffer.h"
+#include "depth.h"
+#include "stencil.h"
 
 ssr_Config config;
 
-typedef enum ssr_VertexAttrMask {
+typedef enum {
 	VERTEXATTR_POS = 1,
 	VERTEXATTR_COLOR = 1 << 1,
 	VERTEXATTR_UV = 1 << 2,
 	VERTEXATTR_NORMAL = 1 << 3,
 } ssr_VertexAttrMask;
 
-typedef struct VertexAttr {
+typedef struct {
 	int start;
 	int offset;
 } VertexAttr;
 
-/*
-** 状态结构
-*/
 static struct {
-	/* MVP矩阵栈 */
 	Mat4 matrices[3][MATRIXDEPTH];
-	uint matrixtop[3];
-	ssr_MatrixMode matrixmode;
+	uint matrix_top[3];
+	ssr_MatrixMode matrix_mode;
+
+	Vec4 viewport;
 
-	/* 屏幕缓冲区 */
 	Color* target;
-	Color* framebuffer;
-	uint buffersize; /*framebuffer size in bytess*/
+	Color* color_buffer; /*screen color buffer*/ 
+	uint buffer_size;
+
+	float* depth_buffer;
+	float* depth_screen_buffer;
+	DepthFunc depth_func;
 
-	/* zbuffer 深度会被映射到0~1的非线性区间*/
-	float* zbuffer;
+	byte* stencil_buffer;
+	byte* stencil_screen_buffer;
+	byte stencil_read_mask;
+	uint stencil_ref;
+	byte stencil_write_mask;
+	StencilFunc stencil_func;
+	StencilOp stencil_failop, stencil_dpfailop, stencil_passop;
 
-	/* 顶点数据 */
-	Vert* verts; uint nverts;
-	uint* indices; uint nprims;
+	Vert* verts; uint vert_count;
+	uint* indices; uint prim_count;
 
-	/* shader program */
 	Program* program;
 	UniformCollection uniforms;
 
-	/* texture relavent */
-	FilterMode filtermode;
-	WrapMode wrapmode;
-
-	//FrameBuffer* framebuffer;
+	FrameBuffer* frame_buffer;
 
 	uint enable;
 
 	struct {
 		ssr_BlendFactor src;
 		ssr_BlendFactor dst;
-	} blendfactor;
+	} blend_factor;
 
 } state;
 
-/*
-** MVP矩阵栈
-*/
-#define MATRIXTOP state.matrixtop[state.matrixmode]
-#define MATRIX state.matrices[state.matrixmode][MATRIXTOP]
-#define MATRIXSTACK state.matrices[state.matrixmode]
+#define MATRIXTOP state.matrix_top[state.matrix_mode]
+#define MATRIX state.matrices[state.matrix_mode][MATRIXTOP]
+#define MATRIXSTACK state.matrices[state.matrix_mode]
 
-#define GETMATRIX(MODE) state.matrices[MODE][state.matrixtop[MODE]]
+#define GETMATRIX(MODE) state.matrices[MODE][state.matrix_top[MODE]]
 
-#define BUFFER (state.framebuffer)
+#define BUFFER (state.color_buffer)
 
+/*topleft*/
 #define contains(x, y, l, r, t, b) (x >= l && x <= r && y <= b && y >= t)
 
 void ssr_init(ssr_Config* conf) {
 	config = *conf;
-	ssrM_zero(state.matrixtop, sizeof(state.matrixtop));
+	ssrM_zero(state.matrix_top, sizeof(state.matrix_top));
+
 	state.target = conf->target;
+
+	int size = config.width * config.height;
+
 	if (config.dbuffer) {
-		state.framebuffer = ssrM_newvector(Color, config.width * config.height);
+		state.color_buffer = ssrM_newvector(Color, size);
 	}
 	else {
-		state.framebuffer = conf->target;
+		state.color_buffer = conf->target;
 	}
-	state.buffersize = sizeof(Color) * config.width * config.height;
-	state.zbuffer = ssrM_newvector(float, config.width * config.height);
-	//memset(state.zbuffer, 0xff, sizeof(uint)*config.width*config.height);
+	state.buffer_size = sizeof(Color) * size;
+
+	state.depth_screen_buffer = ssrM_newvector(float, size);
+	state.depth_buffer = state.depth_screen_buffer;
+	state.depth_func = depth_leuqal;
+
+	state.blend_factor.src = BLEND_SRC_ALPHA;
+	state.blend_factor.dst = BLEND_ONE_MINUS_SRC_ALPHA;
+
+	state.stencil_screen_buffer = ssrM_newvector(byte, size);
+	state.stencil_buffer = state.stencil_screen_buffer;
+	state.stencil_ref = 1;
+	state.stencil_read_mask = 1; 
+	state.stencil_write_mask = 0;
+	state.stencil_func = stencil_equal;
+	state.stencil_failop = stencilop_keep;
+	state.stencil_dpfailop = stencilop_keep;
+	state.stencil_passop = stencilop_replace;
 
-	state.filtermode = FILTERMODE_POINT;
-	state.wrapmode = WRAPMODE_CLAMP;
+	state.frame_buffer = NULL;
 
-	state.blendfactor.src = BLEND_SRC_ALPHA;
-	state.blendfactor.dst = BLEND_ONE_MINUS_SRC_ALPHA;
+	ssr_viewport(0, config.width, config.height, 0);
 }
 
 float ssr_getaspect() {
@@ -104,44 +122,38 @@ int ssr_getframebufferh() {
 	return config.height;
 }
 
-void ssr_setfiltermode(FilterMode filter_mode) {
-	state.filtermode = filter_mode;
-}
-
-void ssr_setwrapmode(WrapMode wrap_mode) {
-	state.wrapmode = wrap_mode;
-}
-
-FilterMode ssr_getfiltermode() {
-	return state.filtermode;
-}
-
-WrapMode ssr_getwrapmode() {
-	return state.wrapmode;
-}
-
 void ssr_bindframebuffer(FrameBuffer* fbo) {
-
+	ssr_assert(fbo);
+	state.frame_buffer = fbo;
+	state.depth_buffer = fbo->depth_buffer;
+	state.stencil_buffer = fbo->stencil_buffer;
 }
 
 void ssr_unbindframebuffer() {
-
+	state.frame_buffer = NULL;
+	state.depth_buffer = state.depth_screen_buffer;
+	state.stencil_buffer = state.stencil_screen_buffer;
 }
 
 void ssr_setblendfunc(ssr_BlendFactor sfactor, ssr_BlendFactor dfactor) {
-	state.blendfactor.src = sfactor;
-	state.blendfactor.dst = dfactor;
+	state.blend_factor.src = sfactor;
+	state.blend_factor.dst = dfactor;
+}
+
+void ssrU_blendscreencolor(uint x, uint y, Color32* src) {
+	Color c = state.color_buffer[x + y * config.width];
+	Color32 dst; color_tocolor32(c, &dst);
+	ssr_blend(src, &dst, src);												
 }
 
 void ssr_matrixmode(ssr_MatrixMode mode) {
-	state.matrixmode = mode;
+	state.matrix_mode = mode;
 }
 
 void ssr_loadidentity() {
 	mat4_setidentity(&MATRIX);
 }
 
-/* push进去之后会将最新的拷贝一份放在栈顶 */
 void ssr_pushmatrix() {
 	ssr_assert(MATRIXTOP < MATRIXDEPTH - 1);
 	++MATRIXTOP;
@@ -152,7 +164,6 @@ void ssr_popmatrix() {
 	MATRIXTOP = clamp(--MATRIXTOP, 0, MATRIXDEPTH - 1);
 }
 
-/*用来做world->view的变换矩阵*/
 /*http://warmcat.org/chai/blog/?p=559*/
 void ssr_lookat(Vec3* pos, Vec3* target, Vec3* up) {
 	ssr_assert(pos && target && up);
@@ -171,7 +182,6 @@ void ssr_lookat(Vec3* pos, Vec3* target, Vec3* up) {
 	mat4_multiply(&MATRIX, &m, &MATRIX);
 }
 
-/* scalematrix * matrix */
 void ssr_scale(float sx, float sy, float sz) {
 	Vec3 scale = { sx, sy, sz };
 	mat4_scale(&MATRIX, &scale, &MATRIX);
@@ -227,6 +237,10 @@ bool ssr_isenable(uint mask) {
 }
 
 void ssr_viewport(float l, float r, float b, float t) {
+	state.viewport.x = l;
+	state.viewport.y = r;
+	state.viewport.z = b;
+	state.viewport.w = t;
 }
 
 void ssr_ortho(float l, float r, float b, float t, float n, float f) {
@@ -236,13 +250,14 @@ void ssr_ortho(float l, float r, float b, float t, float n, float f) {
 }
 
 void ssr_frustum(float l, float r, float b, float t, float n, float f) {
+	ssr_assert(n > 0 && f > 0 && f > n);
 	Mat4 m;
 	mat4_setfrustum(l, r, b, t, n, f, &m);
 	mat4_multiply(&MATRIX, &m, &MATRIX);
 }
 
-/*注意这里nf都要是正数，代表距离*/
 void ssr_perspective(float fov, float aspect, float n, float f) {
+	ssr_assert(n > 0 && f > 0 && f > n);
 	Mat4 m;
 	mat4_setperspective(fov, aspect, n, f, &m);
 	mat4_multiply(&MATRIX, &m, &MATRIX);
@@ -250,30 +265,60 @@ void ssr_perspective(float fov, float aspect, float n, float f) {
 
 void ssr_present() {
 	if (config.dbuffer) {
-		memcpy(state.target, state.framebuffer, state.buffersize);
+		memcpy(state.target, state.color_buffer, state.buffer_size);
 	}
 }
 
-void ssr_clearcolor(Color color) {
+static void _clearscreen(Color color) {
 	if (color == 0x00) {
-		memset(state.framebuffer, 0, state.buffersize);
+		memset(state.color_buffer, 0, state.buffer_size);
 	}
 	else {
 		uint size = config.width * sizeof(Color);
-		for(int x = 0; x < config.width; ++x)
-			state.framebuffer[x] = color;
+		for (int x = 0; x < config.width; ++x)
+			state.color_buffer[x] = color;
 		for (int y = 1; y < config.height; ++y)
-			ssrM_copy(&state.framebuffer[config.width * y], state.framebuffer, size);
+			ssrM_copy(&state.color_buffer[config.width * y], state.color_buffer, size);
+	}
+}
+
+static void _clearcolorbuffer(Color32 color) {
+	Texture* rt;
+	Color32* pixels;
+	for (int i = 0; i < RENDER_TARGET_COUNT; ++i) {
+		rt = state.frame_buffer->render_textures[i];
+		if (rt == NULL) continue;
+		pixels = rt->pixels;
+		uint size = rt->width * sizeof(Color32);
+		for (int x = 0; x < rt->width; ++x)
+			pixels[x] = color;
+		for (int y = 1; y < rt->height; ++y)
+			ssrM_copy(&pixels[rt->width * y], pixels, size);
+	}
+}
+
+void ssr_clearcolor(Color color) {
+	if (state.frame_buffer == NULL) {
+		_clearscreen(color);
+	}
+	else {
+		Color32 c; color_tocolor32(color, &c);
+		_clearcolorbuffer(c);
 	}
 }
 
 void ssr_cleardepth() {
-	//memset(state.zbuffer, 0xff, sizeof(uint)*config.width*config.height);
+	ssr_assert(state.depth_buffer);
 	for (int i = 0; i < config.width * config.height; ++i) {
-		state.zbuffer[i] = 1;
+		state.depth_buffer[i] = 1;
 	}
 }
 
+void ssr_clearstencil(byte val) {
+	ssr_assert(state.stencil_buffer);
+	memset(state.stencil_buffer, val, config.width * config.height);
+}
+
 void ssr_putpoint(uint screenx, uint screeny, Color color) {
 	if (!contains(screenx, screeny, 0, config.width - 1, 0, config.height - 1))
 		return;
@@ -291,26 +336,46 @@ Color ssr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char
 }
 
 bool ssr_testdepth(uint x, uint y, float depth){
+	ssr_assert(state.depth_buffer);
 	uint off = x + y * config.width;
-	return state.zbuffer[off] >= depth;
+	return state.depth_func(depth, state.depth_buffer[off]);
 }
 
 void ssr_writedepth(uint x, uint y, float depth) {
+	ssr_assert(state.depth_buffer);
 	uint off = x + y * config.width;
-	state.zbuffer[off] = depth;
+	state.depth_buffer[off] = depth;
+}
+
+void ssr_setdepthfunc(ssr_DepthFunc func) {
+	switch (func)
+	{
+		case DEPTHFUNC_ALWAYS: state.depth_func = depth_always; break;
+		case DEPTHFUNC_NEVER: state.depth_func = depth_never; break;
+		case DEPTHFUNC_LESS: state.depth_func = depth_less; break;
+		case DEPTHFUNC_EQUAL: state.depth_func = depth_equal; break;
+		case DEPTHFUNC_LEQUAL: state.depth_func = depth_leuqal; break;
+		case DEPTHFUNC_GREATER: state.depth_func = depth_greater; break;
+		case DEPTHFUNC_NOTEQUAL: state.depth_func = depth_notequal; break;
+		case DEPTHFUNC_GEQUAL: state.depth_func = depth_gequer; break;
+		default: ssr_assert(FALSE);
+	}
 }
 
 void ssrU_viewport(Vec2* p, Vec2* out) {
 	ssr_assert(p && out);
-	float halfw = config.width / 2.f, halfh = config.height / 2.f;
-	//out->x = (int)round(p->x * halfw + halfw);
-	//out->y = (int)round(halfh - p->y * halfh);
-	out->x = (int)round((p->x + 1) * (halfw - 0.5f));
-	out->y = (int)round((1 - p->y) * (halfh - 0.5f));
+	float l = state.viewport.x,
+		r = state.viewport.y,
+		b = state.viewport.z,
+		t = state.viewport.w,
+		w2 = (r - l) * 0.5f,
+		h2 = (b - t) * 0.5f;
+	out->x = (int)round((p->x + 1) * (w2 - 0.5f) + l);
+	out->y = (int)round((1 - p->y) * (h2 - 0.5f) + t);
 }
 
 void ssr_blend(Color32* src, Color32* dst, Color32* out) {
-	ssrU_blend(state.blendfactor.src, state.blendfactor.dst, src, dst, out);
+	ssrU_blend(state.blend_factor.src, state.blend_factor.dst, src, dst, out);
 }
 
 static _blend(ssr_BlendFactor factor, Color32* src, Color32* dst, Color32* out) {
@@ -391,18 +456,12 @@ void ssrU_blend(
 	out->a = src->a + dst->a;
 }
 
-Color32 ssr_getfbocolor(uint x, uint y) {
-	Color c = state.framebuffer[x + y * config.width];
-	Color32 c32; color_tocolor32(c, &c32);
-	return c32;
-}
-
-void ssr_bindvertices(Vert* verts, int nverts, uint* indices, int nprims) {
+void ssr_bindvertices(Vert* verts, int vert_count, uint* indices, int prim_count) {
 	ssr_assert(verts && indices);
 	state.verts = verts;
-	state.nverts = nverts;
+	state.vert_count = vert_count;
 	state.indices = indices;
-	state.nprims = nprims;
+	state.prim_count = prim_count;
 }
 
 void ssr_useprogram(Program* program) {
@@ -444,30 +503,31 @@ void ssr_draw(ssr_PrimitiveType primitive) {
 	/*prepare registers if necessary*/
 	if (use_extra_varyings) {
 		ssrS_openregs(varying_flag);
-		ssrS_setregisters(state.nverts);
+		ssrS_setregisters(state.vert_count);
 		ssrS_setactiveregr();
 	}
 
 	/*resize clipping coords buffer*/
-	if (clip_coords.length < state.nverts) {
+	if (clip_coords.length < state.vert_count) {
 		ssrM_resizevector(
 			Vec4, 
 			clip_coords.coords, 
 			clip_coords.length, 
-			state.nverts, 
+			state.vert_count, 
 			FALSE
 		);
 	}
 
 	/*vertex operation*/
-	for (int i = 0; i < state.nverts; ++i) {
+	VertexShader vert_shader = state.program->vertexshader;
+	for (int i = 0; i < state.vert_count; ++i) {
 		Vert* vert = &state.verts[i];
 		ssr_vert_in.vertex = vert;
 		/*set register pointers*/
 		if (use_extra_varyings) {
 			ssrS_setupregisterpointers(vert->index);
 		}
-		state.program->vertexshader(&state.uniforms, &ssr_vert_in, &clip_coords.coords[i]);
+		vert_shader(&state.uniforms, &ssr_vert_in, &clip_coords.coords[i]);
 	}
 
 	/*set register pointer to frag-in*/
@@ -479,9 +539,8 @@ void ssr_draw(ssr_PrimitiveType primitive) {
 	if (primitive == PRIMITIVE_TRIANGLE) {
 		uint i0, i1, i2;
 		Vec4 *h0, *h1, *h2;
-		Vert *v0, *v1, *v2;
 		bool reset_active_reg = FALSE;
-		for (int i = 0; i < state.nprims; ++i) {
+		for (int i = 0; i < state.prim_count; ++i) {
 			i0 = state.indices[i * 3];
 			i1 = state.indices[i * 3 + 1];
 			i2 = state.indices[i * 3 + 2];
@@ -490,10 +549,6 @@ void ssr_draw(ssr_PrimitiveType primitive) {
 			h1 = &clip_coords.coords[i1],
 			h2 = &clip_coords.coords[i2];
 
-			v0 = &state.verts[i0];
-			v1 = &state.verts[i1];
-			v2 = &state.verts[i2];
-
 			/*back face culling*/
 			if (ssr_isenable(ENABLE_BACKFACECULL)) { 
 				float w0 = 1 / h0->w, w1 = 1 / h1->w, w2 = 1 / h2->w;
@@ -508,7 +563,7 @@ void ssr_draw(ssr_PrimitiveType primitive) {
 			}
 
 			/*clipping*/
-			bool clipped = clip_triangle(h0, h1, h2, v0, v1, v2, varying_flag, &clip_buffer);
+			bool clipped = clip_triangle(h0, h1, h2, i0, i1, i2, varying_flag, &clip_buffer);
 
 			/*rasterization*/
 			if (!clipped) {
@@ -516,7 +571,7 @@ void ssr_draw(ssr_PrimitiveType primitive) {
 					reset_active_reg = FALSE;
 					ssrS_setactiveregr();
 				}
-				ssrR_triangle(h0, h1, h2, v0, v1, v2, state.program, &state.uniforms);
+				ssrR_triangle(h0, h1, h2, i0, i1, i2, state.program, &state.uniforms);
 			} else {
 				if (!reset_active_reg) {
 					reset_active_reg = TRUE;
@@ -528,14 +583,14 @@ void ssr_draw(ssr_PrimitiveType primitive) {
 						vt1 = &clip_buffer.vertices[i];
 						vt2 = &clip_buffer.vertices[i + 1];
 						h0 = &vt0->clip_coord; h1 = &vt1->clip_coord; h2 = &vt2->clip_coord;
-						v0 = &vt0->vertex;     v1 = &vt1->vertex;     v2 = &vt2->vertex;
-						ssrR_triangle(h0, h1, h2, v0, v1, v2, state.program, &state.uniforms);
+						i0 = vt0->index;     i1 = vt1->index;     i2 = vt2->index;
+						ssrR_triangle(h0, h1, h2, i0, i1, i2, state.program, &state.uniforms);
 					}
 				}
 			}
 		}
 	} else if (primitive == PRIMITIVE_POINT) {
-
+		
 	} else if (primitive == PRIMITIVE_LINE) {
 		
 	}
@@ -574,3 +629,130 @@ void ssr_setuniformtex(uint idx, Texture* tex) {
 void ssr_setuniformu(void* userdata) {
 	state.uniforms.userdata = userdata;
 }
+
+bool ssr_teststencil(uint x, uint y, bool pass_depth_test) {
+	int index = x + config.width * y;
+	byte mask = state.stencil_read_mask;
+	byte val = state.stencil_buffer[index];
+	return state.stencil_func(val, state.stencil_ref);
+}
+
+void ssr_writestencil(uint x, uint y, bool pass_depth_test, bool pass_stencil_test) {
+	byte write_mask = state.stencil_write_mask;
+	if (write_mask == 0) return;/*dont write*/
+	int index = x + config.width * y;
+	byte read_mask = state.stencil_read_mask;
+	byte val = state.stencil_buffer[index];
+	if (pass_stencil_test && pass_depth_test) {
+		val = state.stencil_passop(val & read_mask, state.stencil_ref & read_mask);
+	}
+	else if (pass_stencil_test && !pass_depth_test) {
+		val = state.stencil_dpfailop(val & read_mask, state.stencil_ref & read_mask);
+	}
+	else if (!pass_stencil_test) {
+		val = state.stencil_failop(val & read_mask, state.stencil_ref & read_mask);
+	}
+	/*https://stackoverflow.com/questions/31660747/what-exactly-does-glstencilmask-do*/
+	state.stencil_buffer[index] &= ~write_mask;
+	state.stencil_buffer[index] |= (val & write_mask);
+}
+
+void ssr_setstencilfunc(ssr_StencilFunc func, byte ref, uint mask) {
+	switch (func)
+	{
+		case STENCILFUNC_ALWAYS: state.stencil_func = stencil_always; break;
+		case STENCILFUNC_NEVER: state.stencil_func = stencil_never; break;
+		case STENCILFUNC_LESS: state.stencil_func = stencil_less; break;
+		case STENCILFUNC_EQUAL: state.stencil_func = stencil_equal; break;
+		case STENCILFUNC_LEQUAL: state.stencil_func = stencil_leuqal; break;
+		case STENCILFUNC_GREATER: state.stencil_func = stencil_greater; break;
+		case STENCILFUNC_NOTEQUAL: state.stencil_func = stencil_notequal; break;
+		case STENCILFUNC_GEQUAL: state.stencil_func = stencil_gequer; break;
+		default: ssr_assert(FALSE);
+	}
+	state.stencil_ref = ref; 
+	state.stencil_read_mask = mask;
+}
+
+static void setstencilop(ssr_StencilOp v, StencilOp* op) {
+	switch (v) {
+		case STENCILOP_KEEP: *op = stencilop_keep; break;
+		case STENCILOP_ZERO: *op = stencilop_zero; break;
+		case STENCILOP_REPLACE: *op = stencilop_replace; break;
+		case STENCILOP_INCR: *op = stencilop_incr; break;
+		case STENCILOP_INCR_WRAP: *op = stencilop_incrwrap; break;
+		case STENCILOP_DECR: *op = stencilop_decr; break;
+		case STENCILOP_DECR_WRAP: *op = stencilop_decrwrap; break;
+		case STENCILOP_INVERT: *op = stencilop_invert; break;
+		default: 
+			ssr_assert(FALSE);
+	}
+}
+
+void ssr_setstencilop(ssr_StencilOp fail, ssr_StencilOp dpfail, ssr_StencilOp pass) {
+	setstencilop(fail, &state.stencil_failop);
+	setstencilop(dpfail, &state.stencil_dpfailop);
+	setstencilop(pass, &state.stencil_passop);
+}
+
+void ssr_setstencilmask(byte mask) {
+	state.stencil_write_mask = mask;
+}
+
+bool ssr_iswritesencil() {
+	return state.stencil_write_mask != 0x00;
+}
+
+void ssr_blendandputpoint(int x, int y, bool blend) {
+	if (!state.frame_buffer) { /*directly onto screen*/
+		if (blend) {
+			ssrU_blendscreencolor(x, y, out_color[0]);
+		}
+		color32_saturate(out_color[0]);
+		ssr_putpoint32(x, y, out_color[0]);
+	}
+	else { /*onto framebuffer color buffer*/
+		Color32 *src, *dst;
+		Texture* rt;
+		for (int i = 0; i < RENDER_TARGET_COUNT; ++i) {
+			rt = state.frame_buffer->render_textures[i];
+			if (rt == NULL || !contains(x, y, 0, rt->width, 0, rt->height))
+				continue;
+			dst = &rt->pixels[x + y * rt->width];
+			src = out_color[i];
+			if (blend) 
+				ssr_blend(src, dst, src);
+			*dst = *src;
+		}
+	}
+}
+
+FrameBuffer* fbo_create() {
+	FrameBuffer* fb = ssrM_new(FrameBuffer);
+	fbo_attachdepthbuffer(fb, 0);
+	fbo_attachstencilbuffer(fb, 0);
+	ssrM_zero(fb->render_textures, sizeof(Texture*) * RENDER_TARGET_COUNT);
+	return fb;
+}
+
+void fbo_attachrendertexture(FrameBuffer* fb, uint attachment, Texture* rt) {
+	fb->render_textures[attachment] = rt;
+}
+
+void fbo_attachdepthbuffer(FrameBuffer* fb, float* depthbuffer) {
+	if (depthbuffer == NULL)
+		fb->depth_buffer = state.depth_screen_buffer;
+	else 
+		fb->depth_buffer = depthbuffer;
+}
+
+void fbo_attachstencilbuffer(FrameBuffer* fb, byte* stencilbuffer) {
+	if (stencilbuffer == NULL)
+		fb->stencil_buffer = state.stencil_screen_buffer;
+	else 
+		fb->stencil_buffer = stencilbuffer;
+}
+
+void fbo_free(FrameBuffer* fb) {
+	ssrM_free(fb);
+}
diff --git a/src/core/device.h b/src/core/device.h
index 6dc8143..0b27b70 100644
--- a/src/core/device.h
+++ b/src/core/device.h
@@ -34,9 +34,21 @@ typedef enum {
 	ENABLE_MULTISAMPLE  = 1 << 2,
 	ENABLE_BLEND        = 1 << 3,
 	ENABLE_WRITEDEPTH   = 1 << 4,
+	ENABLE_STENCILTEST  = 1 << 5,
 } ssr_EnableMask;
 
 typedef enum {
+	DEPTHFUNC_ALWAYS,
+	DEPTHFUNC_NEVER,
+	DEPTHFUNC_LESS,
+	DEPTHFUNC_EQUAL,
+	DEPTHFUNC_LEQUAL,
+	DEPTHFUNC_GREATER,
+	DEPTHFUNC_NOTEQUAL,
+	DEPTHFUNC_GEQUAL,
+} ssr_DepthFunc; 
+
+typedef enum {
 	BLEND_ONE,
 	BLEND_ZERO,
 	BLEND_SRC_COLOR, 
@@ -49,6 +61,28 @@ typedef enum {
 	BLEND_ONE_MINUS_DST_ALPHA,
 } ssr_BlendFactor;
 
+typedef enum {
+	STENCILFUNC_ALWAYS,
+	STENCILFUNC_NEVER,
+	STENCILFUNC_LESS,
+	STENCILFUNC_EQUAL,
+	STENCILFUNC_LEQUAL,
+	STENCILFUNC_GREATER,
+	STENCILFUNC_NOTEQUAL,
+	STENCILFUNC_GEQUAL,
+} ssr_StencilFunc;
+
+typedef enum {
+	STENCILOP_KEEP,
+	STENCILOP_ZERO,
+	STENCILOP_REPLACE,
+	STENCILOP_INCR,
+	STENCILOP_INCR_WRAP,
+	STENCILOP_DECR,
+	STENCILOP_DECR_WRAP,
+	STENCILOP_INVERT,
+} ssr_StencilOp;
+
 void ssr_init(ssr_Config* config);
 
 float ssr_getaspect();
@@ -56,9 +90,6 @@ float ssr_getaspect();
 int ssr_getframebufferw();
 int ssr_getframebufferh();
 
-void ssr_setfiltermode(FilterMode filter_mode);
-void ssr_setwrapmode(WrapMode wrap_mode);
-
 void ssr_matrixmode(ssr_MatrixMode mode);
 void ssr_loadidentity();
 void ssr_pushmatrix();
@@ -87,7 +118,7 @@ void ssr_disable(uint mask);
 bool ssr_isenable(uint mask);
 
 /* 绑定顶点数据 */
-void ssr_bindvertices(Vert* verts, int nverts, uint* indices, int nprims);
+void ssr_bindvertices(Vert* verts, int vert_count, uint* indices, int prim_count);
 void ssr_unbindvertices();
 
 void ssr_useprogram(Program* program);
@@ -103,8 +134,10 @@ void ssr_setuniformu(void* userdata);
 void ssr_draw(ssr_PrimitiveType primitive);
 void ssr_clearcolor(Color color);
 void ssr_cleardepth();
+void ssr_clearstencil(byte val);
 
-void ssr_putpoint(uint screenx, uint screeny, Color color); /*直接修改某个位置的颜色*/
+/*put point onto screen*/
+void ssr_putpoint(uint screenx, uint screeny, Color color);
 void ssr_putpoint32(uint screenx, uint screeny, Color32* c32);
 
 void ssr_present();
@@ -113,20 +146,29 @@ Color ssr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char
 
 bool ssr_testdepth(uint x, uint y, float depth);
 void ssr_writedepth(uint x, uint y, float depth);
+void ssr_setdepthfunc(ssr_DepthFunc func);
 
 void ssr_blend(Color32* src, Color32* dst, Color32* out);
 
 void ssrU_viewport(Vec2* p, Vec2* out);
 void ssrU_blend(ssr_BlendFactor sfactor, ssr_BlendFactor dfactor, Color32* src, Color32* dst, Color* out);
 
-Color32 ssr_getfbocolor(uint x, uint y);
-
-FilterMode ssr_getfiltermode();
-WrapMode ssr_getwrapmode();
-
 void ssr_bindframebuffer(FrameBuffer* fbo);
 void ssr_unbindframebuffer();
 
 void ssr_setblendfunc(ssr_BlendFactor sfactor, ssr_BlendFactor dfactor);
+void ssrU_blendscreencolor(uint x, uint y, Color32* src);
+
+/*将颜色写入对应的屏幕位置*/
+void ssrU_putpointwithblend(uint x, uint y, Color32* color, bool blend);
+
+bool ssr_teststencil(uint x, uint y, bool pass_depth_test);
+void ssr_writestencil(uint x, uint y, bool pass_depth_test, bool pass_stencil_test);
+void ssr_setstencilfunc(ssr_StencilFunc func, byte ref, uint mask);
+void ssr_setstencilop(ssr_StencilOp fail, ssr_StencilOp dpfail, ssr_StencilOp pass);
+void ssr_setstencilmask(byte mask);
+bool ssr_iswritesencil();
+
+void ssr_blendandputpoint(int x, int y, bool blend);
 
 #endif
\ No newline at end of file
diff --git a/src/core/framebuffer.c b/src/core/framebuffer.c
deleted file mode 100644
index 7fa0865..0000000
--- a/src/core/framebuffer.c
+++ /dev/null
@@ -1,5 +0,0 @@
-#include "framebuffer.h"
-
-FrameBuffer* fbo_create(uint height, uint width) {
-
-}
diff --git a/src/core/framebuffer.h b/src/core/framebuffer.h
index 3f03200..78ead0e 100644
--- a/src/core/framebuffer.h
+++ b/src/core/framebuffer.h
@@ -2,15 +2,31 @@
 #define _SOFTSHADEROOM_FRAMEBUFFER_H_
 
 #include "texture.h"
+#include "depth.h"
+#include "stencil.h"
 
 /*frame buffer object*/
 
-typedef Texture RenderTexture;
+#define RENDER_TARGET_COUNT   6
 
+/*
+** OpenGL中fbo的三个挂点可以用renderbuffer或者texture2d绑定，这里考虑效率只提供
+** 8个texture2d可以绑定到color attachment。
+** 如果开启了深度测试或模板测试，那么应该绑定对应的深度缓存和模板缓存
+*/
 typedef struct FrameBuffer{
-	RenderTexture rt;
+	Texture* render_textures[RENDER_TARGET_COUNT]; /*color attachments*/
+	float* depth_buffer; /*depth attachment*/
+	byte* stencil_buffer;  /*stencil attachment*/
 } FrameBuffer;
 
-FrameBuffer* fbo_create(uint height, uint width);
+FrameBuffer* fbo_create();
+
+void fbo_attachrendertexture(FrameBuffer* fb, uint attachment, Texture* rt);
+/*depth buffer和stencil buffer如果传0，绑定到屏幕缓冲区*/
+void fbo_attachdepthbuffer(FrameBuffer* fb, float* depthbuffer);
+void fbo_attachstencilbuffer(FrameBuffer* fb, byte* stencilbuffer);
+
+void fbo_free(FrameBuffer* fb);
 
 #endif
\ No newline at end of file
diff --git a/src/core/rasterizer.c b/src/core/rasterizer.c
index 2319d44..5618fde 100644
--- a/src/core/rasterizer.c
+++ b/src/core/rasterizer.c
@@ -80,28 +80,33 @@ static void puttriangle(Vec2* A, Vec2* B, Vec2* C, Color c) {
 	ssrR_putline(C->x, C->y, B->x, B->y, c);
 }
 
-#define discardif(condition) if(condition) continue
-
 extern FragmentShaderIn ssr_frag_in;
 
-void ssrR_triangle( Vec4* CA, Vec4* CB, Vec4* CC, Vert* A, Vert* B, Vert* C, Program* program, UniformCollection* uniforms ) {
+void ssrR_triangle( 
+	Vec4* CA, Vec4* CB, Vec4* CC, 
+	uint IA, uint IB, uint IC, 
+	Program* program, 
+	UniformCollection* uniforms 
+) {
 	ssr_assert(CA && CB && CC && program);
 
-	static Vec3 SA, SB, SC;
-	static Vec3 bc;
-
+	Vec3 SA, SB, SC;
 	vec4_dividew(CA, &SA); ssrU_viewport(&SA, &SA);
 	vec4_dividew(CB, &SB); ssrU_viewport(&SB, &SB);
 	vec4_dividew(CC, &SC); ssrU_viewport(&SC, &SC);
+
 /*
 	puttriangle(&SA, &SB, &SC, 0xffff0000);
 	return;
 */
-	Vec3 *sa = &SA, *sb = &SB, *sc = &SC, *tmp; Vec4* v4tmp; Vert* vtemp;
+
+	Vec3 *sa = &SA, *sb = &SB, *sc = &SC, *tmp; 
+	Vec4 *v4tmp; 
+	uint itmp;
 #define swap(t, a, b) {t = a; a = b; b = t;} /*sort in y axis*/
-	if (sb->y < sa->y) { swap(tmp, sa, sb); swap(v4tmp, CA, CB); swap(vtemp, A, B); }
-	if (sc->y < sb->y) { swap(tmp, sb, sc); swap(v4tmp, CB, CC); swap(vtemp, B, C); }
-	if (sb->y < sa->y) { swap(tmp, sa, sb); swap(v4tmp, CA, CB); swap(vtemp, A, B); }
+	if (sb->y < sa->y) { swap(tmp, sa, sb); swap(v4tmp, CA, CB); swap(itmp, IA, IB); }
+	if (sc->y < sb->y) { swap(tmp, sb, sc); swap(v4tmp, CB, CC); swap(itmp, IB, IC); }
+	if (sb->y < sa->y) { swap(tmp, sa, sb); swap(v4tmp, CA, CB); swap(itmp, IA, IB); }
 #undef swap
 
 	Vec2 AB = {sb->x - sa->x, sb->y - sa->y}, AC = { sc->x - sa->x, sc->y - sa->y };
@@ -111,60 +116,75 @@ void ssrR_triangle( Vec4* CA, Vec4* CB, Vec4* CC, Vert* A, Vert* B, Vert* C, Pro
 	float invkAB = (sb->x - sa->x) / (sb->y - sa->y + EPSILON);
 	float invkBC = (sc->x - sb->x) / (sc->y - sb->y + EPSILON);
 	
-	Color32 color;
 	float from, to;
-	Vec2 p;
 	float depth;
 	float CAw = 1.f / CA->w, CBw = 1.f / CB->w, CCw = 1.f / CC->w;
 	
-	uint varying_flag = program->varying_flag;
+	bool depth_test    = ssr_isenable(ENABLE_DEPTHTEST);
+	bool multi_sample  = ssr_isenable(ENABLE_MULTISAMPLE);
+	bool blend         = ssr_isenable(ENABLE_BLEND);
+	bool write_depth   = ssr_isenable(ENABLE_WRITEDEPTH);
+	bool stencil_test  = ssr_isenable(ENABLE_STENCILTEST);
+	bool write_stencil = ssr_iswritesencil();
+
+	bool pass_depth_test = TRUE;
+	bool pass_stencil_test = TRUE;
+	bool discard = FALSE;
+
+	FragmentShader frag_shader = program->fragmentshader;
+
+	Vec3 s[2], u; /*edge of triangle*/
 
-	Vec3 s[2], u;
 	s[0].x = sc->x - sa->x; s[0].y = sb->x - sa->x;
 	s[1].x = sc->y - sa->y; s[1].y = sb->y - sa->y;
 
-	bool depth_test   = ssr_isenable(ENABLE_DEPTHTEST);
-	bool multi_sample = ssr_isenable(ENABLE_MULTISAMPLE);
-	bool blend        = ssr_isenable(ENABLE_BLEND);
-	bool write_depth  = ssr_isenable(ENABLE_WRITEDEPTH);
+	Vec2 p;
+	Vec3 bc;
+
+#define discardif(condition) if(condition) continue
 
 #define RENDER_TRIANGLE \
-	for (p.y = FROM->y; p.y < TO->y + OFFSET; ++p.y) {							   \
-		SET_FROM_AND_TO	                                                 \
-		s[1].z = sa->y - p.y;																			       \
-		for (p.x = from; order * (p.x - to) <= 0; p.x += order) {	       \
-			s[0].z = sa->x - p.x;																		       \
-			vec3_cross(&s[0], &s[1], &u);													         \
-			discardif(compare(u.z, 0));														         \
-			u.z = 1.f / u.z;																			         \
-			bc.x = 1.f - (u.x + u.y) * u.z;											           \
-			bc.y = u.y * u.z;																		           \
-			bc.z = u.x * u.z;																		           \
-			discardif(bc.x < 0 || bc.y < 0 || bc.z < 0);				           \
-			/*perspective correction*/																	   \
-			bc.x *= CAw; bc.y *= CBw; bc.z *= CCw;							           \
-			vec3_scale(&bc, 1.f / (bc.x + bc.y + bc.z), &bc);              \
-			/*early depth testing*/																			   \
-			if(depth_test ){											                         \
-				depth = bc.x*sa->z+bc.y*sb->z+bc.z*sc->z;                    \
-				discardif(!ssr_testdepth(p.x, p.y, depth));						       \
-			}																														   \
-			/*set varying variables*/																		   \
-			ssrS_solveregs(&bc, A->index, B->index, C->index);             \
-			/*enter fragment shader*/																			 \
-			if(program->fragmentshader(uniforms, &ssr_frag_in, &color))	{	 \
-				/*blend*/																										 \
-				if(blend) {																									 \
-					Color32 dst; dst = ssr_getfbocolor(p.x, p.y);							 \
-					ssr_blend(&color, &dst, &color);													 \
-				}																														 \
-				if(write_depth) {																						 \
-					ssr_writedepth(p.x, p.y, depth);													 \
-				}																														 \
-				color32_saturate(&color);																		 \
-				ssr_putpoint32(p.x, p.y, &color);														 \
-			}																															 \
-		}																													       \
+	for (p.y = FROM->y; p.y < TO->y + OFFSET; ++p.y) {							      \
+		SET_FROM_AND_TO	                                                    \
+		s[1].z = sa->y - p.y;																			          \
+		for (p.x = from; order * (p.x - to) <= 0; p.x += order) {	          \
+			/*calculate barycentric coordinate*/															\
+			s[0].z = sa->x - p.x;																		          \
+			vec3_cross(&s[0], &s[1], &u);													            \
+			discardif(compare(u.z, 0));														            \
+			u.z = 1.f / u.z;																			            \
+			bc.x = 1.f - (u.x + u.y) * u.z;											              \
+			bc.y = u.y * u.z;																		              \
+			bc.z = u.x * u.z;																		              \
+			discardif(bc.x < 0 || bc.y < 0 || bc.z < 0);				              \
+			/*perspective correction*/																	      \
+			bc.x *= CAw; bc.y *= CBw; bc.z *= CCw;							              \
+			vec3_scale(&bc, 1.f / (bc.x + bc.y + bc.z), &bc);                 \
+			/*early depth testing*/																			      \
+			if(depth_test){											                              \
+				depth = bc.x*sa->z+bc.y*sb->z+bc.z*sc->z;                       \
+				pass_depth_test = ssr_testdepth(p.x, p.y, depth);					      \
+			}																														      \
+			/*early stencil testing*/																			    \
+			if(stencil_test){																							    \
+				pass_stencil_test = ssr_teststencil(p.x, p.y, pass_depth_test); \
+			}																															    \
+			discardif(!pass_depth_test || !pass_stencil_test);						    \
+			/*interpolate varying variables*/															    \
+			ssrS_solveregs(&bc, IA, IB, IC);                                  \
+			/*enter fragment shader*/																			    \
+			discard = !frag_shader(uniforms, &ssr_frag_in, out_color[0]);     \
+			discardif(discard);																								\
+			/*put point*/																										  \
+			ssr_blendandputpoint(p.x, p.y, blend);													  \
+			/*write depth and stencil*/																			  \
+			if(write_depth) {																						      \
+				ssr_writedepth(p.x, p.y, depth);													      \
+			}																														      \
+			if(write_stencil) {																							  \
+				ssr_writestencil(p.x, p.y, pass_depth_test, pass_stencil_test); \
+			}																																  \
+		}																													          \
 	}
 
 #define FROM    sa 
@@ -194,6 +214,8 @@ void ssrR_triangle( Vec4* CA, Vec4* CB, Vec4* CC, Vert* A, Vert* B, Vert* C, Pro
 	}
 
 	RENDER_TRIANGLE
+		
+#undef discardif
 
 #undef FROM 
 #undef TO
diff --git a/src/core/rasterizer.h b/src/core/rasterizer.h
index 4fa2482..5f29677 100644
--- a/src/core/rasterizer.h
+++ b/src/core/rasterizer.h
@@ -13,6 +13,6 @@ bool ssrR_barycentric(Vec2* A, Vec2* B, Vec2* C, Vec2* p, Vec3* out); /*计算重心
 void ssrR_center(Vec2* A, Vec2* B, Vec2* C, Vec2* out); /*获得重心*/
 bool ssrR_ispointintriangle(Vec2* A, Vec2* B, Vec2* C, Vec2* p);
 
-void ssrR_triangle(Vec4* CA, Vec4* CB, Vec4* CC, Vert* A, Vert* B, Vert* C, Program* program, UniformCollection* uniforms);
+void ssrR_triangle(Vec4* CA, Vec4* CB, Vec4* CC, uint IA, uint IB, uint IC, Program* program, UniformCollection* uniforms);
 
 #endif
\ No newline at end of file
diff --git a/src/core/shader.c b/src/core/shader.c
index aa271ed..b28a5e2 100644
--- a/src/core/shader.c
+++ b/src/core/shader.c
@@ -3,42 +3,6 @@
 #include "vert.h"
 #include "device.h"
 
-float* reg_num_00;
-float* reg_num_01;
-float* reg_num_02;
-float* reg_num_03;
-
-Vec2* reg_v2_00;
-Vec2* reg_v2_01;
-Vec2* reg_v2_02;
-Vec2* reg_v2_03;
-Vec2* reg_v2_04;
-Vec2* reg_v2_05;
-Vec2* reg_v2_06;
-Vec2* reg_v2_07;
-
-Vec3* reg_v3_00;
-Vec3* reg_v3_01;
-Vec3* reg_v3_02;
-Vec3* reg_v3_03;
-Vec3* reg_v3_04;
-Vec3* reg_v3_05;
-Vec3* reg_v3_06;
-Vec3* reg_v3_07;
-Vec3* reg_v3_08;
-Vec3* reg_v3_09;
-Vec3* reg_v3_10;
-Vec3* reg_v3_11;
-
-Vec4* reg_v4_00;
-Vec4* reg_v4_01;
-Vec4* reg_v4_02;
-Vec4* reg_v4_03;
-Vec4* reg_v4_04;
-Vec4* reg_v4_05;
-Vec4* reg_v4_06;
-Vec4* reg_v4_07;
-
 extern FragmentShaderIn ssr_frag_in;
 
 Register registers[REG_TOTAL] = {
@@ -164,7 +128,7 @@ void ssrS_setactiveregc() { /*set active reg data from clipping buffer*/
 }
 
 /*计算寄存器中的值并输出*/
-void ssrS_solveregs(Vec3* bc, uint a, uint b, uint c) {
+void ssrS_solveregs(Vec3* bc, uint ia, uint ib, uint ic) {
 	int index = 0;
 	uint stride = 0;
 	ActiveReg* reg;
@@ -175,9 +139,9 @@ void ssrS_solveregs(Vec3* bc, uint a, uint b, uint c) {
 		stride = reg->element_size;
 		*reg->accessor = reg->bcp_interpolator(
 			bc
-			, &reg->data[a*stride]
-			, &reg->data[b*stride]
-			, &reg->data[c*stride]
+			, &reg->data[ia*stride]
+			, &reg->data[ib*stride]
+			, &reg->data[ic*stride]
 			, reg->output
 		);
 	}
@@ -299,3 +263,14 @@ void ssrS_lerpvec4(float t, Vec4* A, Vec4* B, Vec4* out) {
 	out->z = lerp(A->z, B->z, t);
 	out->w = lerp(A->w, B->w, t);
 }
+
+static Color32 _out_color[RENDER_TARGET_COUNT];
+
+Color32* out_color[RENDER_TARGET_COUNT] = {
+	&_out_color[0],
+	&_out_color[1],
+	&_out_color[2],
+	&_out_color[3],
+	&_out_color[4],
+	&_out_color[5],
+};
diff --git a/src/core/shader.h b/src/core/shader.h
index 15edf4c..9ae757b 100644
--- a/src/core/shader.h
+++ b/src/core/shader.h
@@ -4,6 +4,7 @@
 #include "../math/math.h"
 #include "vert.h"
 #include "texture.h"
+#include "framebuffer.h"
 
 typedef struct {
 	/*built in varaibles*/
@@ -174,10 +175,13 @@ void ssrS_setregisters(int capacity);
 /*设置寄存器指针，指向寄存器（在fragment阶段，指针会指向fragmentIn结构）*/
 void ssrS_setupregisterpointers(int idx);
 
-/*设置寄存器指针，指向fragIn结构*/
+/*set register accessor, point to fragin struct*/
 void ssrS_setregtofragin();
 
 #define tex2d(tex, uv) \
-texture_sampling(tex, ssr_getfiltermode(), ssr_getwrapmode(), (uv)->x, (uv)->y)
+texture_sampling(tex, (uv)->x, (uv)->y)
+
+/*frame color buffer output*/
+Color32* out_color[RENDER_TARGET_COUNT];
 
 #endif
\ No newline at end of file
diff --git a/src/core/stencil.c b/src/core/stencil.c
new file mode 100644
index 0000000..3127544
--- /dev/null
+++ b/src/core/stencil.c
@@ -0,0 +1,69 @@
+#include "stencil.h"
+#include "mem.h"
+#include "../util/assert.h"
+
+bool stencil_always(byte src, byte ref) {
+	return 1;
+}
+
+bool stencil_never(byte src, byte ref) {
+	return 0;
+}
+
+bool stencil_less(byte src, byte ref) {
+	return src < ref;
+}
+
+bool stencil_equal(byte src, byte ref) {
+	return src == ref;
+}
+
+bool stencil_leuqal(byte src, byte ref) {
+	return src <= ref;
+}
+
+bool stencil_greater(byte src, byte ref) {
+	return src > ref;
+}
+
+bool stencil_notequal(byte src, byte ref) {
+	return src != ref;
+}
+
+bool stencil_gequer(byte src, byte ref) {
+	return src >= ref;
+}
+
+/*stencil op*/
+
+byte stencilop_keep(byte src, byte ref) {
+	return src;
+}
+
+byte stencilop_zero(byte src, byte ref) {
+	return 0;
+}
+
+byte stencilop_replace(byte src, byte ref) {
+	return ref;
+}
+
+byte stencilop_incr(byte src, byte ref) {
+	return src == 0xff ? 0xff : src + 1;
+}
+
+byte stencilop_incrwrap(byte src, byte ref) {
+	return src == 0xff ? 0 : src + 1;
+}
+
+byte stencilop_decr(byte src, byte ref) {
+	return src == 0 ? 0 : src - 1;
+}
+
+byte stencilop_decrwrap(byte src, byte ref) {
+	return src == 0 ? 0xff : src - 1;
+}
+
+byte stencilop_invert(byte src, byte ref) {
+	return (~src) & 0xff;
+}
diff --git a/src/core/stencil.h b/src/core/stencil.h
new file mode 100644
index 0000000..8af73d0
--- /dev/null
+++ b/src/core/stencil.h
@@ -0,0 +1,28 @@
+#ifndef _SOFTSHADEROOM_STENCIL_H_
+#define _SOFTSHADEROOM_STENCIL_H_
+
+#include "../util/type.h"
+
+typedef bool(*StencilFunc)(byte src, byte ref);
+
+bool stencil_always(byte src, byte ref);
+bool stencil_never(byte src, byte ref);
+bool stencil_less(byte src, byte ref);
+bool stencil_equal(byte src, byte ref);
+bool stencil_leuqal(byte src, byte ref);
+bool stencil_greater(byte src, byte ref);
+bool stencil_notequal(byte src, byte ref);
+bool stencil_gequer(byte src, byte ref);
+
+typedef byte (*StencilOp)(byte src, byte ref);
+
+byte stencilop_keep(byte src, byte ref);
+byte stencilop_zero(byte src, byte ref);
+byte stencilop_replace(byte src, byte ref);
+byte stencilop_incr(byte src, byte ref);
+byte stencilop_incrwrap(byte src, byte ref);
+byte stencilop_decr(byte src, byte ref);
+byte stencilop_decrwrap(byte src, byte ref);
+byte stencilop_invert(byte src, byte ref);
+
+#endif
\ No newline at end of file
diff --git a/src/core/texture.c b/src/core/texture.c
index c7dc884..33a00c5 100644
--- a/src/core/texture.c
+++ b/src/core/texture.c
@@ -48,11 +48,23 @@ Texture* texture_loadfromfile(const char* path) {
 	Texture* texture = ssrM_new(Texture);
 	texture->width = width; texture->height = height;
 	texture->pixels = ssrM_newvector(Color32, width*height);
+	texture->filter_mode = FILTERMODE_POINT;
+	texture->wrap_mode = WRAPMODE_CLAMP;
 	texture_abgr2c32(pixels, texture->pixels, width*height);
 	ssrM_free(pixels);
 	return texture;
 }
 
+Texture* texture_create(uint width, uint height) {
+	Texture* tex = ssrM_new(Texture);
+	tex->pixels = ssrM_newvector(Color32, width*height);
+	tex->width = width;
+	tex->height = height;
+	tex->filter_mode = FILTERMODE_POINT;
+	tex->wrap_mode = WRAPMODE_CLAMP;
+	return  tex;
+}
+
 static Color32 sampling(Texture* tex, WrapMode wrap_mode, int x, int y) {
 	if (wrap_mode == WRAPMODE_CLAMP) { /*clamp*/
 		x = clamp(x, 0, tex->width - 1);
@@ -64,8 +76,10 @@ static Color32 sampling(Texture* tex, WrapMode wrap_mode, int x, int y) {
 	return tex->pixels[x + y * tex->width];
 }
 
-Color32 texture_sampling(Texture* tex, FilterMode filter_mode, WrapMode wrap_mode, float x01, float y01) {
+Color32 texture_sampling(Texture* tex, float x01, float y01) {
 	ssr_assert(tex);
+	FilterMode filter_mode = tex->filter_mode;
+	WrapMode wrap_mode = tex->wrap_mode;
 	float x = x01 * tex->width, y = (1 - y01) * tex->height; /*map to texture coordinate*/
 	int x_min = floor(x), y_min = floor(y);
 	int x_max = ceil(x), y_max = ceil(y);
@@ -94,3 +108,19 @@ Color32 texture_sampling(Texture* tex, FilterMode filter_mode, WrapMode wrap_mod
 	}
 	*/
 }
+
+void texture_setfiltermode(Texture* tex, FilterMode filter) {
+	ssr_assert(tex);
+	tex->filter_mode = filter;
+}
+
+void texture_setwrapmode(Texture* tex, WrapMode wrap) {
+	ssr_assert(tex);
+	tex->wrap_mode = wrap;
+}
+
+void texture_free(Texture* tex) {
+	if (tex->pixels) 
+		ssrM_free(tex->pixels);
+	ssrM_free(tex);
+}
diff --git a/src/core/texture.h b/src/core/texture.h
index 9e0d884..06016ad 100644
--- a/src/core/texture.h
+++ b/src/core/texture.h
@@ -14,13 +14,26 @@ typedef enum {
 	WRAPMODE_CLAMP,
 } WrapMode;
 
+typedef enum {
+	COMPONENT_RGBA, 
+	COMPONENT_DEPTH
+} TextureComponent;
+
 typedef struct {
 	uint width, height;
-	Color32* pixels;
+	Color32* pixels; /*RGBA*/
+	FilterMode filter_mode; 
+	WrapMode wrap_mode;
 } Texture;
 
 Texture* texture_loadfromfile(const char* path);
+Texture* texture_create(uint width, uint height);
+
+void texture_setfiltermode(Texture* tex, FilterMode filter);
+void texture_setwrapmode(Texture* tex, WrapMode wrap);
+
+Color32 texture_sampling(Texture* tex, float x, float y);
 
-Color32 texture_sampling(Texture* tex, FilterMode filter_mode, WrapMode wrap_mode, float x, float y);
+void texture_free(Texture* tex);
 
 #endif
\ No newline at end of file
diff --git a/src/core/vert.h b/src/core/vert.h
index faf027e..8578d87 100644
--- a/src/core/vert.h
+++ b/src/core/vert.h
@@ -16,6 +16,8 @@ typedef uint Color; // ARGB
 
 typedef Vec4 Color32;
 
+Color32 COLOR32_WHITE;
+
 Color color32_tocolor(Color32* c);
 void color_tocolor32(Color c, Color32* out);
 void color32_saturate(Color32* c);