ggl_context.h

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    GGLclampx           r;
    GGLclampx           g;
    GGLclampx           b;
    GGLclampx           a;
    GGLclampx           depth;
    GGLint              stencil;
    uint32_t            colorPacked;
    uint32_t            depthPacked;
    uint32_t            stencilPacked;
    uint32_t            dirty;
};

struct fog_state_t {
    uint8_t     color[3];
    uint8_t     reserved;
};

struct logic_op_state_t {
    uint16_t            opcode;
};

struct alpha_test_state_t {
    uint16_t            func;
    GGLcolor            ref;
};

struct depth_test_state_t {
    uint16_t            func;
    GGLclampx           clearValue;
};

struct scissor_t {
    uint32_t            user_left;
    uint32_t            user_right;
    uint32_t            user_top;
    uint32_t            user_bottom;
    uint32_t            left;
    uint32_t            right;
    uint32_t            top;
    uint32_t            bottom;
};

struct pixel_t {
    uint32_t    c[4];
    uint8_t     s[4];
};

struct surface_t {
    union {
        GGLSurface      s;
        struct {
        uint32_t            reserved;
        uint32_t			width;
        uint32_t			height;
        int32_t             stride;
        uint8_t*			data;	
        uint8_t				format;
        uint8_t				dirty;
        uint8_t				pad[2];
        };
    };
    void                (*read) (const surface_t* s, context_t* c,
                                uint32_t x, uint32_t y, pixel_t* pixel);
    void                (*write)(const surface_t* s, context_t* c,
                                uint32_t x, uint32_t y, const pixel_t* pixel);
};

// ----------------------------------------------------------------------------

struct texture_shade_t {
    union {
        struct {
            int32_t             is0;
            int32_t             idsdx;
            int32_t             idsdy;
            int                 sscale;
            int32_t             it0;
            int32_t             idtdx;
            int32_t             idtdy;
            int                 tscale;
        };
        struct {
            int32_t             v;
            int32_t             dx;
            int32_t             dy;
            int                 scale;
        } st[2];
    };
};

struct texture_iterators_t {
    // these are not encoded in the same way than in the
    // texture_shade_t structure
    union {
        struct {
            GGLfixed			ydsdy;
            GGLfixed            dsdx;
            GGLfixed            dsdy;
            int                 sscale;
            GGLfixed			ydtdy;
            GGLfixed            dtdx;
            GGLfixed            dtdy;
            int                 tscale;
        };
        struct {
            GGLfixed			ydvdy;
            GGLfixed            dvdx;
            GGLfixed            dvdy;
            int                 scale;
        } st[2];
    };
};

struct texture_t {
	surface_t			surface;
	texture_iterators_t	iterators;
    texture_shade_t     shade;
	uint32_t			s_coord;
	uint32_t            t_coord;
	uint16_t			s_wrap;
	uint16_t            t_wrap;
	uint16_t            min_filter;
	uint16_t            mag_filter;
    uint16_t            env;
    uint8_t             env_color[4];
	uint8_t				enable;
	uint8_t				dirty;
};

struct raster_t {
    GGLfixed            x;
    GGLfixed            y;
};

struct framebuffer_t {
    surface_t           color;
    surface_t           read;
	surface_t			depth;
	surface_t			stencil;
    int16_t             *coverage;
    size_t              coverageBufferSize;
};

// ----------------------------------------------------------------------------

struct iterators_t {
	int32_t             xl;
	int32_t             xr;
    int32_t             y;
	GGLcolor			ydady;
	GGLcolor			ydrdy;
	GGLcolor			ydgdy;
	GGLcolor			ydbdy;
	GGLfixed			ydzdy;
	GGLfixed			ydwdy;
	GGLfixed			ydfdy;
};

struct shade_t {
	GGLcolor			a0;
    GGLcolor            dadx;
    GGLcolor            dady;
	GGLcolor			r0;
    GGLcolor            drdx;
    GGLcolor            drdy;
	GGLcolor			g0;
    GGLcolor            dgdx;
    GGLcolor            dgdy;
	GGLcolor			b0;
    GGLcolor            dbdx;
    GGLcolor            dbdy;
	uint32_t            z0;
    GGLfixed32          dzdx;
    GGLfixed32          dzdy;
	GGLfixed            w0;
    GGLfixed            dwdx;
    GGLfixed            dwdy;
	uint32_t			f0;
    GGLfixed            dfdx;
    GGLfixed            dfdy;
};

// these are used in the generated code
// we use this mirror structure to improve
// data locality in the pixel pipeline
struct generated_tex_vars_t {
    uint32_t    width;
    uint32_t    height;
    uint32_t    stride;
    int32_t     data;
    int32_t     dsdx;
    int32_t     dtdx;
    int32_t     spill[2];
};

struct generated_vars_t {
    struct {
        int32_t c;
        int32_t dx;
    } argb[4];
    int32_t     aref;
    int32_t     dzdx;
    int32_t     zbase;
    int32_t     f;
    int32_t     dfdx;
    int32_t     spill[3];
    generated_tex_vars_t    texture[GGL_TEXTURE_UNIT_COUNT];
    int32_t     rt;
    int32_t     lb;
};

// ----------------------------------------------------------------------------

struct state_t {
	framebuffer_t		buffers;
	texture_t			texture[GGL_TEXTURE_UNIT_COUNT];
    scissor_t           scissor;
    raster_t            raster;
	blend_state_t		blend;
    alpha_test_state_t  alpha_test;
    depth_test_state_t  depth_test;
    mask_state_t        mask;
    clear_state_t       clear;
    fog_state_t         fog;
    logic_op_state_t    logic_op;
    uint32_t            enables;
    uint32_t            enabled_tmu;
    needs_t             needs;
};

// ----------------------------------------------------------------------------

struct context_t {
	GGLContext          procs;
	state_t             state;
    shade_t             shade;
	iterators_t         iterators;
    generated_vars_t    generated_vars                __attribute__((aligned(32)));
    uint8_t             ditherMatrix[GGL_DITHER_SIZE] __attribute__((aligned(32)));
    uint32_t            packed;
    uint32_t            packed8888;
    const GGLFormat*    formats;
    uint32_t            dirty;
    texture_t*          activeTMU;
    uint32_t            activeTMUIndex;

    void                (*init_y)(context_t* c, int32_t y);
	void                (*step_y)(context_t* c);
	void                (*scanline)(context_t* c);
    void                (*span)(context_t* c);
    void                (*rect)(context_t* c, size_t yc);
    
    void*               base;
    Assembly*           scanline_as;
    GGLenum             error;
};

// ----------------------------------------------------------------------------

void ggl_init_context(context_t* context);
void ggl_uninit_context(context_t* context);
void ggl_error(context_t* c, GGLenum error);
int64_t ggl_system_time();

// ----------------------------------------------------------------------------

};

#endif // ANDROID_GGL_CONTEXT_H