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#ifndef _SOFTSHADEROOM_SHADER_H_
#define _SOFTSHADEROOM_SHADER_H_
#include "../math/math.h"
#include "vert.h"
typedef struct UniformCollection {
/*built in varaibles*/
Mat4* model;
Mat4* view;
Mat4* projection;
Mat4* mvp;
Mat4* mv;
/*extra variables*/
Mat4 var_mat4[8];
Vec4 var_vec4[8];
Vec3 var_vec3[8];
Vec2 var_vec2[8];
float var_num[8];
/*userdata*/
void* userdata;
} UniformCollection;
#define UM4(i) (&uniforms->var_mat4[i])
#define UV2(i) (&uniforms->var_vec2[i])
#define UV3(i) (&uniforms->var_vec3[i])
#define UV4(i) (&uniforms->var_vec4[i])
#define UN(i) (&uniforms->var_num[i])
typedef struct VertexShaderIn {
Vert* vertex;
} VertexShaderIn;
typedef void(*VertexShader)(UniformCollection* uniforms, VertexShaderIn* in, Vec4* homocoord);
typedef struct FragmentShaderIn {
/*value from vertices interpolation*/
Vec3 position;
Vec3 normal;
Vec3 tangent;
Vec2 texcoord;
Color color;
Vec4 joint;
Vec4 weight;
/*value from registers interpolation*/
float num[4];
Vec2 v2[6];
Vec3 v3[8];
Vec4 v4[6];
} FragmentShaderIn;
typedef bool(*FragmentShader)(UniformCollection* uniforms, FragmentShaderIn* in, Color* color);
typedef struct Program {
VertexShader vertexshader;
FragmentShader fragmentshader;
uint varying_flag;
} Program;
#define VARYING_NONE (0)
#define VARYING_POSITION (1 << 31)
#define VARYING_NORMAL (1 << 30)
#define VARYING_TANGENT (1 << 29)
#define VARYING_TEXCOORD (1 << 28)
#define VARYING_COLOR (1 << 27)
#define VARYING_JOINT (1 << 26)
#define VARYING_WEIGHT (1 << 25)
#define VARYING_UNUSED (1 << 24)
#define VARYING_BASIC ( VARYING_UNUSED | VARYING_POSITION | VARYING_NORMAL | VARYING_TANGENT | VARYING_TEXCOORD | VARYING_COLOR | VARYING_JOINT | VARYING_WEIGHT )
#define VARYING_NUM_00 (1 << 20)
#define VARYING_NUM_01 (1 << 21)
#define VARYING_NUM_02 (1 << 22)
#define VARYING_NUM_03 (1 << 23)
#define VARYING_NUM (VARYING_NUM_00 | VARYING_NUM_01 | VARYING_NUM_02 | VARYING_NUM_03 )
#define VARYING_V2_00 (1)
#define VARYING_V2_01 (1 << 1)
#define VARYING_V2_02 (1 << 2)
#define VARYING_V2_03 (1 << 3)
#define VARYING_V2_04 (1 << 4)
#define VARYING_V2_05 (1 << 5)
#define VARYING_V2 (VARYING_V2_00 | VARYING_V2_01 | VARYING_V2_02 | VARYING_V2_03 | VARYING_V2_04 | VARYING_V2_05)
#define VARYING_V3_00 (1 << 6)
#define VARYING_V3_01 (1 << 7)
#define VARYING_V3_02 (1 << 8)
#define VARYING_V3_03 (1 << 9)
#define VARYING_V3_04 (1 << 10)
#define VARYING_V3_05 (1 << 11)
#define VARYING_V3_06 (1 << 12)
#define VARYING_V3_07 (1 << 13)
#define VARYING_V3 (VARYING_V3_00 | VARYING_V3_01 | VARYING_V3_02 | VARYING_V3_03 | VARYING_V3_04 | VARYING_V3_05| VARYING_V3_06| VARYING_V3_07)
#define VARYING_V4_00 (1 << 14)
#define VARYING_V4_01 (1 << 15)
#define VARYING_V4_02 (1 << 16)
#define VARYING_V4_03 (1 << 17)
#define VARYING_V4_04 (1 << 18)
#define VARYING_V4_05 (1 << 19)
#define VARYING_V4 (VARYING_V4_00 | VARYING_V4_01 | VARYING_V4_02 | VARYING_V4_03 | VARYING_V4_04 | VARYING_V4_05)
#define VARYING_EXTRA (~VARYING_BASIC)
float* ssrS_bcpnum(Vec3* bc, float A, float B, float C, float* out);
Color* ssrS_bcpcolor(Vec3* bc, Color A, Color B, Color C, Color* out);
Vec2* ssrS_bcpvec2(Vec3* bc, Vec2* A, Vec2* B, Vec2* C, Vec2* out);
Vec3* ssrS_bcpvec3(Vec3* bc, Vec3* A, Vec3* B, Vec3* C, Vec3* out);
Vec4* ssrS_bcpvec4(Vec3* bc, Vec4* A, Vec4* B, Vec4* C, Vec4* out);
void ssrS_lerpnum(float t, float A, float B, float* out);
void ssrS_lerpcolor(float t, Color A, Color B, Color* out);
void ssrS_lerpvec2(float t, Vec2* A, Vec2* B, Vec2* out);
void ssrS_lerpvec3(float t, Vec3* A, Vec3* B, Vec3* out);
void ssrS_lerpvec4(float t, Vec4* A, Vec4* B, Vec4* out);
void ssrS_setregisters(uint flag, int capacity);
/*
** 顶点数据外，还提供额外的寄存器用来存储vertex shader输出的顶点额外数据
** 共24个
*/
enum RegisterType {
REGTYPE_NUM = 1,
REGTYPE_VEC2,
REGTYPE_VEC4,
REGTYPE_VEC3,
};
typedef struct Register {
uint length;
uint type;
union {
float* num;
Vec2* v2;
Vec4* v4;
Vec3* v3;
};
} Register;
#define REG_NUM_COUNT 4
#define REG_V2_COUNT 6
#define REG_V3_COUNT 8
#define REG_V4_COUNT 6
Register reg_num[4];
Register reg_v2[6];
Register reg_v3[8];
Register reg_v4[6];
void reg_all_wipe(); /*标记清空所有寄存器*/
/*寄存器指针，使用错误可能会出现野指针*/
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;
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;
Vec4* reg_v4_00;
Vec4* reg_v4_01;
Vec4* reg_v4_02;
Vec4* reg_v4_03;
Vec4* reg_v4_04;
Vec4* reg_v4_05;
/*设置寄存器指针，指向寄存器（注意在fragment阶段，指针会指向fragmentIn结构）*/
void ssrS_setupregisterpoints(uint extra_varying_flag, int idx);
/*设置寄存器指针，指向fragIn结构*/
void ssrS_setregtofragin(uint extra_varying_flag, FragmentShaderIn* frag_in);
#endif
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