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#pragma once
#include <SDL.h>
#include <GLES2/gl2.h>
#include "../util.h"
#include "../util/matrix.h"
typedef struct GL_FONT *PGL_FONT;
typedef struct GL_DATA *PGL_DATA;
struct VERTEX {
VEC2 pos;
VEC2 uv;
CLR clr;
U8 sampler;
};
struct GL_SHADER_DEF {
const char* name;
const char* code;
I32 type;
U32 id;
U8 compiled;
};
struct GL_SHADER_PROGRAM {
const char* name;
GL_SHADER_DEF fsh;
GL_SHADER_DEF vsh;
U32 id;
U32 vbuffer;
GL_DATA* gl;
};
struct GL_TEX2D {
GLuint id;
char name[256];
U32 width;
U32 height;
U32 channels;
U8* data;
};
typedef struct GL_DATA {
SDL_Window* window;
SDL_GLContext ctx;
SDL_Renderer* renderer;
I32 canvas_size[2];
LIST<GL_SHADER_PROGRAM*> programs;
LIST<GL_TEX2D*> textures;
LIST<GL_FONT*> fonts;
I32 shader_texture_limit;
U64 last_tick;
F32 frametime;
F32 fps;
GLuint vbuffer;
VEC2 clip_start;
VEC2 clip_dim;
VEC2 viewport_start;
VEC2 viewport_dim;
MAT4* proj_matrix;
} *PGL_DATA;
GL_DATA* gl_instance();
GL_DATA* gl_create( I32* _canvas );
void gl_destroy( GL_DATA* gl );
void gl_gen_buffers( GL_DATA* gl );
STAT gl_beginframe( GL_DATA* gl );
STAT gl_endframe( GL_DATA* gl );
STAT gl_shader_compile( GL_DATA* gl, GL_SHADER_DEF* shader );
void gl_shader_destroy( GL_DATA* gl, GL_SHADER_DEF* shader );
GL_SHADER_PROGRAM* gl_program_create( GL_DATA* gl, const char* name, U32 size = sizeof(GL_SHADER_PROGRAM) );
STAT gl_program_compile( GL_DATA* gl, GL_SHADER_PROGRAM* program );
void gl_program_destroy( GL_DATA* gl, GL_SHADER_PROGRAM* program );
GL_TEX2D* gl_texture_create( GL_DATA* gl, const char* name );
GL_TEX2D* gl_texture_from_file( GL_DATA* gl, const char* name );
GL_TEX2D* gl_texture_from_bitmap( GL_DATA* gl, const char* name, U8* bitmap, U32 width, U32 height );
void gl_texture_destroy( GL_DATA* gl, GL_TEX2D* tex );
void gl_update_window( GL_DATA* gl, I32* size );
void gl_set_clip( GL_DATA* gl, VEC2 start, VEC2 dim );
void gl_get_clip( GL_DATA* gl, VEC2* start, VEC2* dim );
void gl_set_viewport( GL_DATA* gl, VEC2 start, VEC2 dim );
void gl_get_viewport( GL_DATA* gl, VEC2* start, VEC2* dim );
void gl_reset_clip( GL_DATA* gl );
// special sampler id for no texture
const U8 SAMPLER_ID_NONE = 255;
extern I32 SAMPLER_INDICES[255];
template <typename VERTEX>
LIST<VERTEX> triangle_fan_to_list( VERTEX* vertices, U32 vert_count ) {
LIST<VERTEX> ret{};
if( vert_count < 3 ) {
return ret;
}
ret.reserve( (vert_count - 2) * 3 );
VERTEX* start = &vertices[0];
VERTEX* last = &vertices[1];
for( U32 i = 2; i < vert_count; ++i ) {
ret.push( *start );
ret.push( *last );
ret.push( vertices[i] );
last = &vertices[i];
}
return ret;
}
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