#ifndef PRIVATE_H
#define PRIVATE_H

#include <stdint.h>

#include "../include/gl.h"
#include "../containers/aligned_vector.h"
#include "../containers/named_array.h"

#define TRACE_ENABLED 0
#define TRACE() if(TRACE_ENABLED) {fprintf(stderr, "%s\n", __func__);}

#define VERTEX_ENABLED_FLAG     (1 << 0)
#define UV_ENABLED_FLAG         (1 << 1)
#define ST_ENABLED_FLAG         (1 << 2)
#define DIFFUSE_ENABLED_FLAG    (1 << 3)
#define NORMAL_ENABLED_FLAG     (1 << 4)

#define MAX_TEXTURE_SIZE 1024

typedef struct {
    pvr_poly_hdr_t hdr;
} PVRHeader;

typedef struct {
    unsigned int flags;      /* Constant PVR_CMD_USERCLIP */
    unsigned int d1, d2, d3; /* Ignored for this type */
    unsigned int sx,         /* Start x */
             sy,         /* Start y */
             ex,         /* End x */
             ey;         /* End y */
} PVRTileClipCommand; /* Tile Clip command for the pvr */

typedef struct {
    unsigned int list_type;
    AlignedVector vector;
} PolyList;

typedef struct {
    /* Palette data is always stored in RAM as RGBA8888 and packed as ARGB8888
     * when uploaded to the PVR */
    GLubyte*    data;
    GLushort    width;  /* The user specified width */
    GLushort     size;   /* The size of the bank (16 or 256) */
    GLenum      format;
    GLshort      bank;
} TexturePalette;

typedef struct {
    GLushort width;
    GLushort height;
    GLuint   color; /* This is the PVR texture format */
    GLubyte  env;
    GLushort  mipmap;  /* Bitmask of supplied mipmap levels */
    GLubyte mipmapCount; /* The number of mipmap levels */
    GLubyte  uv_clamp;
    GLuint   index;
    GLvoid *data;
    GLuint dataStride;

    GLenum minFilter;
    GLenum magFilter;

    GLboolean isCompressed;
    GLboolean isPaletted;

    TexturePalette* palette;

    /* When using the shared palette, this is the bank (0-3) */
    GLushort shared_bank;
} TextureObject;

typedef struct {
    GLfloat emissive[4];
    GLfloat ambient[4];
    GLfloat diffuse[4];
    GLfloat specular[4];
    GLfloat exponent;
} Material;

typedef struct {
    GLfloat position[4];
    GLfloat spot_direction[3];
    GLfloat spot_cutoff;
    GLfloat constant_attenuation;
    GLfloat linear_attenuation;
    GLfloat quadratic_attenuation;
    GLfloat spot_exponent;
    GLfloat diffuse[4];
    GLfloat specular[4];
    GLfloat ambient[4];
    GLboolean is_directional;
} LightSource;

typedef struct {
    /* Same 32 byte layout as pvr_vertex_t */
    uint32_t flags;
    float xyz[3];
    float uv[2];
    uint8_t bgra[4];

    /* In the pvr_vertex_t structure, this next 4 bytes is oargb
     * but we're not using that for now, so having W here makes the code
     * simpler */
    float w;
} Vertex;

/* ClipVertex doesn't have room for these, so we need to parse them
 * out separately. Potentially 'w' will be housed here if we support oargb */
typedef struct {
    float nxyz[3];
    float st[2];
} VertexExtra;

/* Generating PVR vertices from the user-submitted data gets complicated, particularly
 * when a realloc could invalidate pointers. This structure holds all the information
 * we need on the target vertex array to allow passing around to the various stages (e.g. generate/clip etc.)
 */
typedef struct {
    PolyList* output;
    uint32_t header_offset; // The offset of the header in the output list
    uint32_t start_offset; // The offset into the output list
    uint32_t count; // The number of vertices in this output

    /* Pointer to count * VertexExtra; */
    AlignedVector* extras;
} SubmissionTarget;

PVRHeader* _glSubmissionTargetHeader(SubmissionTarget* target);
Vertex* _glSubmissionTargetStart(SubmissionTarget* target);
Vertex* _glSubmissionTargetEnd(SubmissionTarget* target);

typedef enum {
    CLIP_RESULT_ALL_IN_FRONT,
    CLIP_RESULT_ALL_BEHIND,
    CLIP_RESULT_ALL_ON_PLANE,
    CLIP_RESULT_FRONT_TO_BACK,
    CLIP_RESULT_BACK_TO_FRONT
} ClipResult;


#define A8IDX 3
#define R8IDX 2
#define G8IDX 1
#define B8IDX 0

struct SubmissionTarget;

void _glClipLineToNearZ(const Vertex* v1, const Vertex* v2, Vertex* vout, float* t);
void _glClipTriangleStrip(SubmissionTarget* target, uint8_t fladeShade);

PolyList *_glActivePolyList();
PolyList *_glTransparentPolyList();

void _glInitAttributePointers();
void _glInitContext();
void _glInitLights();
void _glInitImmediateMode(GLuint initial_size);
void _glInitMatrices();
void _glInitFramebuffers();

void _glMatrixLoadNormal();
void _glMatrixLoadModelView();
void _glMatrixLoadTexture();
void _glApplyRenderMatrix();

matrix_t* _glGetProjectionMatrix();
matrix_t* _glGetModelViewMatrix();

void _glWipeTextureOnFramebuffers(GLuint texture);
GLubyte _glCheckImmediateModeInactive(const char* func);

pvr_poly_cxt_t* _glGetPVRContext();
GLubyte _glInitTextures();

void _glUpdatePVRTextureContext(pvr_poly_cxt_t* context, GLshort textureUnit);

typedef struct {
    const void* ptr;
    GLenum type;
    GLsizei stride;
    GLint size;
} AttribPointer;

GLboolean _glCheckValidEnum(GLint param, GLint* values, const char* func);

GLuint _glGetEnabledAttributes();
AttribPointer* _glGetVertexAttribPointer();
AttribPointer* _glGetDiffuseAttribPointer();
AttribPointer* _glGetNormalAttribPointer();
AttribPointer* _glGetUVAttribPointer();
AttribPointer* _glGetSTAttribPointer();
GLenum _glGetShadeModel();

TextureObject* _glGetTexture0();
TextureObject* _glGetTexture1();
TextureObject* _glGetBoundTexture();
GLubyte _glGetActiveTexture();
GLuint _glGetActiveClientTexture();
TexturePalette* _glGetSharedPalette(GLshort bank);
void _glSetInternalPaletteFormat(GLenum val);

GLboolean _glIsSharedTexturePaletteEnabled();
void _glApplyColorTable(TexturePalette *palette);

GLboolean _glIsBlendingEnabled();
GLboolean _glIsAlphaTestEnabled();

GLboolean _glIsMipmapComplete(const TextureObject* obj);
GLubyte* _glGetMipmapLocation(TextureObject* obj, GLuint level);
GLuint _glGetMipmapLevelCount(TextureObject* obj);

GLboolean _glIsLightingEnabled();
GLboolean _glIsLightEnabled(GLubyte light);
GLboolean _glIsColorMaterialEnabled();
void _glCalculateLightingContribution(const GLint light, const GLfloat* pos, const GLfloat* normal, uint8_t* bgra, GLfloat* colour);

unsigned char _glIsClippingEnabled();
void _glEnableClipping(unsigned char v);

void _glKosThrowError(GLenum error, const char *function);
void _glKosPrintError();
GLubyte _glKosHasError();

#define PVR_VERTEX_BUF_SIZE 2560 * 256
#define MAX_TEXTURE_UNITS 2
#define MAX_LIGHTS 8

#define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )

#define mat_trans_fv12() { \
        __asm__ __volatile__( \
                              "fldi1 fr15\n" \
                              "ftrv	 xmtrx, fv12\n" \
                              "fldi1 fr14\n" \
                              "fdiv	 fr15, fr14\n" \
                              "fmul	 fr14, fr12\n" \
                              "fmul	 fr14, fr13\n" \
                              : "=f" (__x), "=f" (__y), "=f" (__z) \
                              : "0" (__x), "1" (__y), "2" (__z) \
                              : "fr15" ); \
    }

#endif // PRIVATE_H