SDL_gpu_GLES_2.h

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#ifndef _SDL_GPU_GLES_2_H__
#define _SDL_GPU_GLES_2_H__

#include "SDL_gpu.h"
#include "SDL_platform.h"

#if !defined(SDL_GPU_DISABLE_GLES) && !defined(SDL_GPU_DISABLE_GLES_2)

#ifdef __IPHONEOS__
    #include <OpenGLES/ES2/gl.h>
    #include <OpenGLES/ES2/glext.h>
#else
    #include "GLES2/gl2.h"
    #include "GLES2/gl2ext.h"
#endif

    #define glVertexAttribI1i glVertexAttrib1f
    #define glVertexAttribI2i glVertexAttrib2f
    #define glVertexAttribI3i glVertexAttrib3f
    #define glVertexAttribI4i glVertexAttrib4f
    #define glVertexAttribI1ui glVertexAttrib1f
    #define glVertexAttribI2ui glVertexAttrib2f
    #define glVertexAttribI3ui glVertexAttrib3f
    #define glVertexAttribI4ui glVertexAttrib4f
#endif



#define GPU_CONTEXT_DATA ContextData_GLES_2
#define GPU_IMAGE_DATA ImageData_GLES_2
#define GPU_TARGET_DATA TargetData_GLES_2


#define GPU_DEFAULT_TEXTURED_VERTEX_SHADER_SOURCE \
"#version 100\n\
precision mediump float;\n\
precision mediump int;\n\
\
attribute vec2 gpu_Vertex;\n\
attribute vec2 gpu_TexCoord;\n\
attribute vec4 gpu_Color;\n\
uniform mat4 gpu_ModelViewProjectionMatrix;\n\
\
varying vec4 color;\n\
varying vec2 texCoord;\n\
\
void main(void)\n\
{\n\
    color = gpu_Color;\n\
    texCoord = vec2(gpu_TexCoord);\n\
    gl_Position = gpu_ModelViewProjectionMatrix * vec4(gpu_Vertex, 0.0, 1.0);\n\
}"

// Tier 3 uses shader attributes to send position, texcoord, and color data for each vertex.
#define GPU_DEFAULT_UNTEXTURED_VERTEX_SHADER_SOURCE \
"#version 100\n\
precision mediump float;\n\
precision mediump int;\n\
\
attribute vec2 gpu_Vertex;\n\
attribute vec4 gpu_Color;\n\
uniform mat4 gpu_ModelViewProjectionMatrix;\n\
\
varying vec4 color;\n\
\
void main(void)\n\
{\n\
    color = gpu_Color;\n\
    gl_Position = gpu_ModelViewProjectionMatrix * vec4(gpu_Vertex, 0.0, 1.0);\n\
}"


#define GPU_DEFAULT_TEXTURED_FRAGMENT_SHADER_SOURCE \
"#version 100\n\
precision mediump float;\n\
precision mediump int;\n\
\
varying vec4 color;\n\
varying vec2 texCoord;\n\
\
uniform sampler2D tex;\n\
\
void main(void)\n\
{\n\
    gl_FragColor = texture2D(tex, texCoord) * color;\n\
}"

#define GPU_DEFAULT_UNTEXTURED_FRAGMENT_SHADER_SOURCE \
"#version 100\n\
precision mediump float;\n\
precision mediump int;\n\
\
varying vec4 color;\n\
\
void main(void)\n\
{\n\
    gl_FragColor = color;\n\
}"




typedef struct ContextData_GLES_2
{
    SDL_Color last_color;
    Uint8 last_use_texturing;
    unsigned int last_shape;
    Uint8 last_use_blending;
    GPU_BlendMode last_blend_mode;
    GPU_Rect last_viewport;
    GPU_Camera last_camera;
    Uint8 last_camera_inverted;
    
    GPU_Image* last_image;
    GPU_Target* last_target;
    float* blit_buffer;  // Holds sets of 4 vertices, each with interleaved position, tex coords, and colors (e.g. [x0, y0, z0, s0, t0, r0, g0, b0, a0, ...]).
    unsigned short blit_buffer_num_vertices;
    unsigned short blit_buffer_max_num_vertices;
    unsigned short* index_buffer;  // Indexes into the blit buffer so we can use 4 vertices for every 2 triangles (1 quad)
    unsigned int index_buffer_num_vertices;
    unsigned int index_buffer_max_num_vertices;
    
    // Tier 3 rendering
    unsigned int blit_VBO[2];  // For double-buffering
    Uint8 blit_VBO_flop;
    GPU_ShaderBlock shader_block[2];
    GPU_ShaderBlock current_shader_block;
    
    GPU_AttributeSource shader_attributes[16];
    unsigned int attribute_VBO[16];
} ContextData_GLES_2;

typedef struct ImageData_GLES_2
{
    int refcount;
    Uint32 handle;
    Uint32 format;
} ImageData_GLES_2;

typedef struct TargetData_GLES_2
{
    int refcount;
    Uint32 handle;
    Uint32 format;
} TargetData_GLES_2;



#endif