gx_tev.h

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#include <stdint.h>
#include <stdbool.h>
 
// This header is not supposed to be included directly.
// Instead include gx.h
 
/* -------------------TEV Stage Control--------------------- */
 
typedef struct {
    uint32_t color_control;
    uint32_t alpha_control;
} gx_tev_stage_t;
 
typedef enum {
    GX_TEV_STAGE_0,
    GX_TEV_STAGE_1,
    GX_TEV_STAGE_2,
    GX_TEV_STAGE_3,
    GX_TEV_STAGE_4,
    GX_TEV_STAGE_5,
    GX_TEV_STAGE_6,
    GX_TEV_STAGE_7,
    GX_TEV_STAGE_8,
    GX_TEV_STAGE_9,
    GX_TEV_STAGE_10,
    GX_TEV_STAGE_11,
    GX_TEV_STAGE_12,
    GX_TEV_STAGE_13,
    GX_TEV_STAGE_14,
    GX_TEV_STAGE_15
} gx_tev_stage_id;
 
typedef enum {
    GX_TEV_IO_PREVIOUS   = 0x0,
    GX_TEV_IO_REGISTER_0 = 0x2,
    GX_TEV_IO_REGISTER_1 = 0x4,
    GX_TEV_IO_REGISTER_2 = 0x6,
    GX_TEV_IO_TEXTURE    = 0x8,
    GX_TEV_IO_RASTERIZER = 0xA,
    GX_TEV_IO_ONE        = 0xC, // Unsupported as alpha input
    GX_TEV_IO_HALF       = 0xD, // Unsupported as alpha input
    GX_TEV_IO_CONSTANT   = 0xE,
    GX_TEV_IO_ZERO       = 0xF,
 
    GX_TEV_IO_ALPHA      = 0x1, // Use alpha channel for color input
} gx_tev_io_t;
 
typedef enum {
    GX_TEV_SCALE_1,
    GX_TEV_SCALE_2,
    GX_TEV_SCALE_4,
    GX_TEV_SCALE_HALF
} gx_tev_scale_t;
 
typedef enum {
    GX_TEV_BIAS_0,
    GX_TEV_BIAS_ADD_HALF,
    GX_TEV_BIAS_SUB_HALF
} gx_tev_bias_t;
 
typedef enum {
    GX_TEV_COMPARE_R8_GREATER    = 0x0,
    GX_TEV_COMPARE_R8_EQUAL      = 0x1,
    GX_TEV_COMPARE_GR16_GREATER  = 0x2,
    GX_TEV_COMPARE_GR16_EQUAL    = 0x3,
    GX_TEV_COMPARE_BGR24_GREATER = 0x4,
    GX_TEV_COMPARE_BGR24_EQUAL   = 0x5,
    GX_TEV_COMPARE_RGB8_GT       = 0x6,
    GX_TEV_COMPARE_RGB8_EQ       = 0x7,
    GX_TEV_COMPARE_A8_GREATER    = 0x6,
    GX_TEV_COMPARE_A8_EQUAL      = 0x7
} gx_tev_compare_t;

extern void gx_set_tev_stages(int count);

extern void gx_initialize_tev_stage(gx_tev_stage_t* tev);

extern void gx_flash_tev_stage(gx_tev_stage_id id, const gx_tev_stage_t* tev);

extern void gx_set_tev_stage_color_input(gx_tev_stage_t* tev, gx_tev_io_t a, gx_tev_io_t b, gx_tev_io_t c, gx_tev_io_t d);

extern void gx_set_tev_stage_alpha_input(gx_tev_stage_t* tev, gx_tev_io_t a, gx_tev_io_t b, gx_tev_io_t c, gx_tev_io_t d);

extern void gx_set_tev_stage_color_output(gx_tev_stage_t* tev, gx_tev_io_t out, bool clamp);

extern void gx_set_tev_stage_alpha_output(gx_tev_stage_t* tev, gx_tev_io_t out, bool clamp);

extern void gx_set_tev_stage_color_biasing(gx_tev_stage_t* tev, bool subtract, gx_tev_bias_t bias, gx_tev_scale_t scale);

extern void gx_set_tev_stage_color_comparison(gx_tev_stage_t* tev, gx_tev_compare_t comparison);

extern void gx_set_tev_stage_alpha_biasing(gx_tev_stage_t* tev, bool subtract, gx_tev_bias_t bias, gx_tev_scale_t scale);

extern void gx_set_tev_stage_alpha_comparison(gx_tev_stage_t* tev, gx_tev_compare_t comparison);
 
/* -------------------TEV Registers --------------------- */

extern void gx_flash_tev_register_color(gx_tev_io_t reg, int r, int g, int b, int a);