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-rw-r--r--src/core/device.c99
-rw-r--r--src/core/device.h5
-rw-r--r--src/core/rasterizer.c24
-rw-r--r--src/core/rasterizer.h2
4 files changed, 80 insertions, 50 deletions
diff --git a/src/core/device.c b/src/core/device.c
index ce13c72..5ff39ef 100644
--- a/src/core/device.c
+++ b/src/core/device.c
@@ -459,14 +459,28 @@ void ssrU_blend(
out->a = src->a + dst->a;
}
-void ssr_bindvertices(Vertex* verts, int vert_count, uint* indices, int prim_count) {
- ssr_assert(verts && indices);
+void ssr_bindvertices(Vertex* verts, int vert_count) {
+ ssr_assert(verts);
state.verts = verts;
state.vert_count = vert_count;
+}
+
+void ssr_unbindvertices() {
+ state.verts = NULL;
+ state.vert_count = 0;
+}
+
+void ssr_bindindices(uint* indices, int prim_count) {
+ ssr_assert(indices);
state.indices = indices;
state.prim_count = prim_count;
}
+void ssr_unbindindices() {
+ state.indices = NULL;
+ state.prim_count = 0;
+}
+
void ssr_useprogram(Program* program) {
ssr_assert(program);
state.program = program;
@@ -485,11 +499,45 @@ static struct {
extern ClippedBuffer clip_buffer; /*clipping result*/
+static bool is_back_face(Vec4* c0, Vec4* c1, Vec4*c2) {
+ /*cull in ndc*/
+ float w0 = 1 / c0->w, w1 = 1 / c1->w, w2 = 1 / c2->w;
+ bool all_front = w0 > 0 && w1 > 0 && w2 > 0;
+ if (all_front)
+ {
+ Vec2 ab, ac;
+ ab.x = c1->x * w1 - c0->x * w0;
+ ab.y = c1->y * w1 - c0->y * w0;
+ ac.x = c2->x * w2 - c0->x * w0;
+ ac.y = c2->y * w2 - c0->y * w0;
+ if (ab.x * ac.y - ab.y * ac.x <= 0) {
+ return TRUE;
+ }
+ }
+ return FALSE;
+ /*OpenGL algrithm*/
+ /*
+ float w0 = max(1 / c0->w, 0), w1 = 1 / c1->w, w2 = 1 / c2->w;
+ Vec2 a = { c0->x * w0, c0->y * w0 };
+ Vec2 b = { c1->x * w1, c1->y * w1 };
+ Vec2 c = { c2->x * w2, c2->y * w2 };
+ float signed_area = 0;
+ signed_area += a.x * b.y - a.y * b.x;
+ signed_area += b.x * c.y - b.y * c.x;
+ signed_area += c.x * a.y - c.y * a.x;
+ if (signed_area <= 0) {
+ return TRUE;
+ }
+ return FALSE;
+ */
+}
+
static void render_prims_triangle(uint varying_flag) {
uint i0, i1, i2;
Vec4 *c0, *c1, *c2;
bool reset_active_reg = FALSE;
bool clipped = FALSE;
+ bool is_enable_backface_cull = ssr_isenable(ENABLE_BACKFACECULL);
for (int i = 0; i < state.prim_count; ++i) {
i0 = state.indices[i * 3];
i1 = state.indices[i * 3 + 1];
@@ -501,34 +549,17 @@ static void render_prims_triangle(uint varying_flag) {
/*early back face culling*/
bool early_culled = FALSE;
- if (ssr_isenable(ENABLE_BACKFACECULL)) {
- /*cull in ndc*/
+ if (is_enable_backface_cull) {
float w0 = 1 / c0->w, w1 = 1 / c1->w, w2 = 1 / c2->w;
- bool all_front = w0 > 0 && w1 > 0 && w2 > 0;
- if (all_front)
- {
+ if (w0 <= 0 && w1 <= 0 && w2 <= 0) {
+ early_culled = TRUE;
+ continue;
+ }
+ else if (w0 > 0 && w1 > 0 && w2 > 0) {
early_culled = TRUE;
- Vec2 ab, ac;
- ab.x = c1->x * w1 - c0->x * w0;
- ab.y = c1->y * w1 - c0->y * w0;
- ac.x = c2->x * w2 - c0->x * w0;
- ac.y = c2->y * w2 - c0->y * w0;
- if (ab.x * ac.y - ab.y * ac.x <= 0) {
- continue; /*cull*/
- }
+ if (is_back_face(c0, c1, c2))
+ continue;
}
- //OpenGL algrithm:
- //float w0 = max(1 / c0->w, 0), w1 = 1 / c1->w, w2 = 1 / c2->w;
- //Vec2 a = { c0->x * w0, c0->y * w0 };
- //Vec2 b = { c1->x * w1, c1->y * w1 };
- //Vec2 c = { c2->x * w2, c2->y * w2 };
- //float signed_area = 0;
- //signed_area += a.x * b.y - a.y * b.x;
- //signed_area += b.x * c.y - b.y * c.x;
- //signed_area += c.x * a.y - c.y * a.x;
- //if (signed_area <= 0) {
- // continue; /*cull*/
- //}
}
/*clipping*/
@@ -540,7 +571,12 @@ static void render_prims_triangle(uint varying_flag) {
reset_active_reg = FALSE;
ssrS_setactiveregr();
}
- ssrR_triangle(c0, c1, c2, i0, i1, i2, state.program, early_culled);
+ /*late back face culling*/
+ if (!early_culled && is_enable_backface_cull) {
+ if(is_back_face(c0, c1, c2))
+ continue;
+ }
+ ssrR_triangle(c0, c1, c2, i0, i1, i2, state.program);
}
else {
if (!reset_active_reg) {
@@ -554,7 +590,12 @@ static void render_prims_triangle(uint varying_flag) {
vt2 = &clip_buffer.vertices[i + 1];
c0 = &vt0->clip_coord; c1 = &vt1->clip_coord; c2 = &vt2->clip_coord;
i0 = vt0->index; i1 = vt1->index; i2 = vt2->index;
- ssrR_triangle(c0, c1, c2, i0, i1, i2, state.program, early_culled);
+ /*late back face culling*/
+ if (!early_culled && is_enable_backface_cull) {
+ if (is_back_face(c0, c1, c2))
+ continue;
+ }
+ ssrR_triangle(c0, c1, c2, i0, i1, i2, state.program);
}
}
}
diff --git a/src/core/device.h b/src/core/device.h
index 79ffd4b..6d0b61d 100644
--- a/src/core/device.h
+++ b/src/core/device.h
@@ -118,9 +118,12 @@ void ssr_disable(uint mask);
bool ssr_isenable(uint mask);
/* 绑定顶点数据 */
-void ssr_bindvertices(Vertex* verts, int vert_count, uint* indices, int prim_count);
+void ssr_bindvertices(Vertex* verts, int vert_count);
void ssr_unbindvertices();
+void ssr_bindindices(uint* indices, int prim_count);
+void ssr_unbindindices();
+
void ssr_useprogram(Program* program);
void ssr_unuseprogram();
diff --git a/src/core/rasterizer.c b/src/core/rasterizer.c
index 55d4ad3..9276cbd 100644
--- a/src/core/rasterizer.c
+++ b/src/core/rasterizer.c
@@ -44,7 +44,7 @@ float ssrR_area(Vec2* v1, Vec2* v2, Vec2* v3) {
return area;
}
-/*from https://github.com/ssloy/tinyrenderer */
+/*https://github.com/ssloy/tinyrenderer */
bool ssrR_barycentric(Vec2* A, Vec2* B, Vec2* C, Vec2* p, Vec3* out) {
ssr_assert(A && B && C && p && out);
Vec3 s[2], u;
@@ -87,24 +87,10 @@ extern UniformCollection* g_uniforms ;
void ssrR_triangle(
Vec4* CA, Vec4* CB, Vec4* CC,
uint IA, uint IB, uint IC,
- Program* program,
- bool early_culled
+ Program* program
) {
ssr_assert(CA && CB && CC && program);
- /*late back face culling*/
- if (!early_culled && ssr_isenable(ENABLE_BACKFACECULL)) {
- float w0 = 1 / CA->w, w1 = 1 / CB->w, w2 = 1 / CC->w;
- Vec2 ab, ac;
- ab.x = CB->x * w1 - CA->x * w0;
- ab.y = CB->y * w1 - CA->y * w0;
- ac.x = CC->x * w2 - CA->x * w0;
- ac.y = CC->y * w2 - CA->y * w0;
- if (ab.x * ac.y - ab.y * ac.x <= 0) {
- return;
- }
- }
-
UniformCollection* uniforms = g_uniforms;
Vec4 SA, SB, SC;
@@ -164,7 +150,7 @@ void ssrR_triangle(
for (p.x = from; order * (p.x - to) <= 0; p.x += order) { \
/*calculate barycentric coordinate*/ \
s[0].z = sa->x - p.x; \
- internal_vec3_cross(&s[0], &s[1], &u); \
+ internal_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; \
@@ -173,7 +159,7 @@ void ssrR_triangle(
discardif(bc.x < 0 || bc.y < 0 || bc.z < 0); \
/*perspective correction*/ \
bc.x *= CAw; bc.y *= CBw; bc.z *= CCw; \
- internal_vec3_scale(&bc, 1.f / (bc.x + bc.y + bc.z), &bc); \
+ internal_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; \
@@ -189,7 +175,7 @@ void ssrR_triangle(
/*interpolate varying variables*/ \
ssrS_solveregsbcp(&bc, IA, IB, IC); \
/*enter fragment shader*/ \
- discard = !frag_shader(out_color[0]); \
+ discard = !frag_shader(out_color[0]); \
discardif(discard); \
/*put point*/ \
ssr_blendandputpoint(p.x, p.y, blend); \
diff --git a/src/core/rasterizer.h b/src/core/rasterizer.h
index fce8376..c7ccc3c 100644
--- a/src/core/rasterizer.h
+++ b/src/core/rasterizer.h
@@ -13,7 +13,7 @@ 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, uint IA, uint IB, uint IC, Program* program, bool early_called);
+void ssrR_triangle(Vec4* CA, Vec4* CB, Vec4* CC, uint IA, uint IB, uint IC, Program* program);
void ssrR_line(Vec4* CA, Vec4* CB, uint IA, uint IB, Program* program);
void ssrR_point(Vec4* CA, uint IA, Program* program);
generated by cgit v1.1-26-g67d0 at 2025-05-29 07:35:04 +0000