/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"

#if SDL_VIDEO_RENDER_PS2

#include "../SDL_sysrender.h"
#include "SDL_hints.h"

#include <kernel.h>
#include <malloc.h>
#include <gsKit.h>
#include <dmaKit.h>
#include <gsToolkit.h>

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeclaration-after-statement"
#include <gsInline.h>
#pragma GCC diagnostic pop

/* turn black GS Screen */
#define GS_BLACK GS_SETREG_RGBA(0x00, 0x00, 0x00, 0x80)
/* Size of Persistent drawbuffer (Single Buffered) */
#define RENDER_QUEUE_PER_POOLSIZE 1024 * 256 // 256K of persistent renderqueue
/* Size of Oneshot drawbuffer (Double Buffered, so it uses this size * 2) */
#define RENDER_QUEUE_OS_POOLSIZE 1024 * 1024 * 2 // 2048K of oneshot renderqueue

typedef struct
{
    GSGLOBAL *gsGlobal;
    uint64_t drawColor;
    SDL_Rect *viewport;
    int32_t vsync_callback_id;
    uint8_t vsync; /* 0 (Disabled), 1 (Enabled), 2 (Dynamic) */
} PS2_RenderData;

static int vsync_sema_id = 0;

/* PRIVATE METHODS */
static int vsync_handler(int reason)
{
    iSignalSema(vsync_sema_id);

    ExitHandler();
    return 0;
}

/* Copy of gsKit_sync_flip, but without the 'flip' */
static void gsKit_sync(GSGLOBAL *gsGlobal)
{
    if (!gsGlobal->FirstFrame) {
        WaitSema(vsync_sema_id);
    }
    while (PollSema(vsync_sema_id) >= 0)
        ;
}

/* Copy of gsKit_sync_flip, but without the 'sync' */
static void gsKit_flip(GSGLOBAL *gsGlobal)
{
    if (!gsGlobal->FirstFrame) {
        if (gsGlobal->DoubleBuffering == GS_SETTING_ON) {
            GS_SET_DISPFB2(gsGlobal->ScreenBuffer[gsGlobal->ActiveBuffer & 1] / 8192,
                           gsGlobal->Width / 64, gsGlobal->PSM, 0, 0);

            gsGlobal->ActiveBuffer ^= 1;
        }
    }

    gsKit_setactive(gsGlobal);
}

static int PixelFormatToPS2PSM(Uint32 format)
{
    switch (format) {
    case SDL_PIXELFORMAT_ABGR1555:
        return GS_PSM_CT16;
    default:
        return GS_PSM_CT32;
    }
}

static void PS2_WindowEvent(SDL_Renderer *renderer, const SDL_WindowEvent *event)
{
}

static int PS2_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GSTEXTURE *ps2_tex = (GSTEXTURE *)SDL_calloc(1, sizeof(GSTEXTURE));

    if (!ps2_tex) {
        return SDL_OutOfMemory();
    }

    ps2_tex->Width = texture->w;
    ps2_tex->Height = texture->h;
    ps2_tex->PSM = PixelFormatToPS2PSM(texture->format);
    ps2_tex->Mem = memalign(128, gsKit_texture_size_ee(ps2_tex->Width, ps2_tex->Height, ps2_tex->PSM));

    if (!ps2_tex->Mem) {
        SDL_free(ps2_tex);
        return SDL_OutOfMemory();
    }

    texture->driverdata = ps2_tex;

    return 0;
}

static int PS2_LockTexture(SDL_Renderer *renderer, SDL_Texture *texture,
                           const SDL_Rect *rect, void **pixels, int *pitch)
{
    GSTEXTURE *ps2_texture = (GSTEXTURE *)texture->driverdata;

    *pixels =
        (void *)((Uint8 *)ps2_texture->Mem + rect->y * ps2_texture->Width * SDL_BYTESPERPIXEL(texture->format) +
                 rect->x * SDL_BYTESPERPIXEL(texture->format));
    *pitch = ps2_texture->Width * SDL_BYTESPERPIXEL(texture->format);
    return 0;
}

static void PS2_UnlockTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GSTEXTURE *ps2_texture = (GSTEXTURE *)texture->driverdata;
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;

    gsKit_TexManager_invalidate(data->gsGlobal, ps2_texture);
}

static int PS2_UpdateTexture(SDL_Renderer *renderer, SDL_Texture *texture,
                             const SDL_Rect *rect, const void *pixels, int pitch)
{
    const Uint8 *src;
    Uint8 *dst;
    int row, length, dpitch;
    src = pixels;

    PS2_LockTexture(renderer, texture, rect, (void **)&dst, &dpitch);
    length = rect->w * SDL_BYTESPERPIXEL(texture->format);
    if (length == pitch && length == dpitch) {
        SDL_memcpy(dst, src, length * rect->h);
    } else {
        for (row = 0; row < rect->h; ++row) {
            SDL_memcpy(dst, src, length);
            src += pitch;
            dst += dpitch;
        }
    }

    PS2_UnlockTexture(renderer, texture);

    return 0;
}

static void PS2_SetTextureScaleMode(SDL_Renderer *renderer, SDL_Texture *texture, SDL_ScaleMode scaleMode)
{
    GSTEXTURE *ps2_texture = (GSTEXTURE *)texture->driverdata;
    /*
     set texture filtering according to scaleMode
     suported hint values are nearest (0, default) or linear (1)
     gskit scale mode is either GS_FILTER_NEAREST (good for tile-map)
     or GS_FILTER_LINEAR (good for scaling)
     */
    uint32_t gsKitScaleMode = (scaleMode == SDL_ScaleModeNearest
                                   ? GS_FILTER_NEAREST
                                   : GS_FILTER_LINEAR);
    ps2_texture->Filter = gsKitScaleMode;
}

static int PS2_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture)
{
    return 0;
}

static int PS2_QueueSetViewport(SDL_Renderer *renderer, SDL_RenderCommand *cmd)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;
    const SDL_Rect *viewport = &cmd->data.viewport.rect;
    data->viewport = (SDL_Rect *)viewport;

    data->gsGlobal->OffsetX = (int)((2048.0f + (float)viewport->x) * 16.0f);
    data->gsGlobal->OffsetY = (int)((2048.0f + (float)viewport->y) * 16.0f);
    gsKit_set_scissor(data->gsGlobal, GS_SETREG_SCISSOR(viewport->x, viewport->x + viewport->w, viewport->y, viewport->y + viewport->h));

    return 0;
}

static int PS2_QueueSetDrawColor(SDL_Renderer *renderer, SDL_RenderCommand *cmd)
{
    return 0; /* nothing to do in this backend. */
}

static int PS2_QueueDrawPoints(SDL_Renderer *renderer, SDL_RenderCommand *cmd, const SDL_FPoint *points, int count)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;
    GSPRIMPOINT *vertices = (GSPRIMPOINT *)SDL_AllocateRenderVertices(renderer, count * sizeof(GSPRIMPOINT), 4, &cmd->data.draw.first);
    uint8_t colorR, colorG, colorB, colorA;
    gs_rgbaq rgbaq;
    int i;

    if (!vertices) {
        return -1;
    }

    cmd->data.draw.count = count;

    colorR = cmd->data.draw.r;
    colorG = cmd->data.draw.g;
    colorB = cmd->data.draw.b;
    colorA = cmd->data.draw.a;
    rgbaq = color_to_RGBAQ(colorR, colorG, colorB, colorA, 0.0f);

    for (i = 0; i < count; i++, vertices++, points++) {
        vertices->xyz2 = vertex_to_XYZ2(data->gsGlobal, points->x, points->y, 0);
        vertices->rgbaq = rgbaq;
    }
    return 0;
}

static int PS2_QueueGeometry(SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Texture *texture,
                             const float *xy, int xy_stride, const SDL_Color *color, int color_stride, const float *uv, int uv_stride,
                             int num_vertices, const void *indices, int num_indices, int size_indices,
                             float scale_x, float scale_y)
{
    int i;
    int count = indices ? num_indices : num_vertices;
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;

    cmd->data.draw.count = count;
    size_indices = indices ? size_indices : 0;

    if (texture) {
        GSPRIMUVPOINT *vertices = (GSPRIMUVPOINT *) SDL_AllocateRenderVertices(renderer, count * sizeof(GSPRIMUVPOINT), 4, &cmd->data.draw.first);
        GSTEXTURE *ps2_tex = (GSTEXTURE *) texture->driverdata;

        if (!vertices) {
            return -1;
        }

        for (i = 0; i < count; i++) {
            int j;
            float *xy_;
            float *uv_;
            SDL_Color col_;
            if (size_indices == 4) {
                j = ((const Uint32 *)indices)[i];
            } else if (size_indices == 2) {
                j = ((const Uint16 *)indices)[i];
            } else if (size_indices == 1) {
                j = ((const Uint8 *)indices)[i];
            } else {
                j = i;
            }

            xy_ = (float *)((char *)xy + j * xy_stride);
            col_ = *(SDL_Color *)((char *)color + j * color_stride);
            uv_ = (float *)((char *)uv + j * uv_stride);

            vertices->xyz2 = vertex_to_XYZ2(data->gsGlobal, xy_[0] * scale_x, xy_[1] * scale_y, 0);
            vertices->rgbaq = color_to_RGBAQ(col_.r, col_.g, col_.b, col_.a, 0);
            vertices->uv = vertex_to_UV(ps2_tex, uv_[0] * ps2_tex->Width, uv_[1] * ps2_tex->Height);

            vertices++;
        }

    } else {
        GSPRIMPOINT *vertices = (GSPRIMPOINT *)SDL_AllocateRenderVertices(renderer, count * sizeof(GSPRIMPOINT), 4, &cmd->data.draw.first);

        if (!vertices) {
            return -1;
        }

        for (i = 0; i < count; i++) {
            int j;
            float *xy_;
            SDL_Color col_;
            if (size_indices == 4) {
                j = ((const Uint32 *)indices)[i];
            } else if (size_indices == 2) {
                j = ((const Uint16 *)indices)[i];
            } else if (size_indices == 1) {
                j = ((const Uint8 *)indices)[i];
            } else {
                j = i;
            }

            xy_ = (float *)((char *)xy + j * xy_stride);
            col_ = *(SDL_Color *)((char *)color + j * color_stride);

            vertices->xyz2 = vertex_to_XYZ2(data->gsGlobal, xy_[0] * scale_x, xy_[1] * scale_y, 0);
            vertices->rgbaq = color_to_RGBAQ(col_.r, col_.g, col_.b, col_.a, 0.0f);

            vertices++;
        }
    }

    return 0;
}

static int PS2_RenderSetViewPort(SDL_Renderer *renderer, SDL_RenderCommand *cmd)
{
    return 0; /* nothing to do in this backend. */
}

static int PS2_RenderSetClipRect(SDL_Renderer *renderer, SDL_RenderCommand *cmd)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;
    SDL_Rect *viewport = data->viewport;

    const SDL_Rect *rect = &cmd->data.cliprect.rect;

    if (cmd->data.cliprect.enabled) {
        /* We need to do it relative to saved viewport */
        viewport->x += rect->x;
        viewport->y += rect->y;
        viewport->w = SDL_min(viewport->w, rect->w);
        viewport->h = SDL_min(viewport->h, rect->h);
    }
    gsKit_set_scissor(data->gsGlobal, GS_SETREG_SCISSOR(viewport->x, viewport->x + viewport->w, viewport->y, viewport->y + viewport->h));

    return 0;
}

static int PS2_RenderSetDrawColor(SDL_Renderer *renderer, SDL_RenderCommand *cmd)
{
    int colorR, colorG, colorB, colorA;

    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;

    colorR = (cmd->data.color.r);
    colorG = (cmd->data.color.g);
    colorB = (cmd->data.color.b);
    colorA = (cmd->data.color.a);
    data->drawColor = GS_SETREG_RGBAQ(colorR, colorG, colorB, colorA, 0x00);
    return 0;
}

static int PS2_RenderClear(SDL_Renderer *renderer, SDL_RenderCommand *cmd)
{
    int colorR, colorG, colorB, colorA, offsetX, offsetY;
    SDL_Rect *viewport;

    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;

    colorR = (cmd->data.color.r);
    colorG = (cmd->data.color.g);
    colorB = (cmd->data.color.b);
    colorA = (cmd->data.color.a);

    /* Clear the screen, so let's put default viewport */
    gsKit_set_scissor(data->gsGlobal, GS_SCISSOR_RESET);
    /* Put back original offset */
    offsetX = data->gsGlobal->OffsetX;
    offsetY = data->gsGlobal->OffsetY;
    data->gsGlobal->OffsetX = (int)(2048.0f * 16.0f);
    data->gsGlobal->OffsetY = (int)(2048.0f * 16.0f);
    gsKit_clear(data->gsGlobal, GS_SETREG_RGBAQ(colorR, colorG, colorB, colorA, 0x00));

    /* Put back original offset */
    data->gsGlobal->OffsetX = offsetX;
    data->gsGlobal->OffsetY = offsetY;

    // /* Put back view port */
    viewport = data->viewport;
    gsKit_set_scissor(data->gsGlobal, GS_SETREG_SCISSOR(viewport->x, viewport->x + viewport->w, viewport->y, viewport->y + viewport->h));
    
    return 0;
}

static void PS2_SetBlendMode(PS2_RenderData *data, int blendMode)
{
#define A_COLOR_SOURCE 0
#define A_COLOR_DEST   1
#define A_COLOR_NULL   2
#define A_ALPHA_SOURCE 0
#define A_ALPHA_DEST   1
#define A_ALPHA_FIX    2

    switch (blendMode) {
    case SDL_BLENDMODE_NONE:
    {
        data->gsGlobal->PrimAlphaEnable = GS_SETTING_OFF;
        break;
    }
    case SDL_BLENDMODE_BLEND:
    {
        gsKit_set_primalpha(data->gsGlobal, GS_SETREG_ALPHA(A_COLOR_SOURCE, A_COLOR_DEST, A_ALPHA_SOURCE, A_COLOR_DEST, 0), 0);
        data->gsGlobal->PrimAlphaEnable = GS_SETTING_ON;
        break;
    }
    case SDL_BLENDMODE_ADD:
    {
        gsKit_set_primalpha(data->gsGlobal, GS_SETREG_ALPHA(A_COLOR_SOURCE, A_COLOR_NULL, A_ALPHA_FIX, A_COLOR_DEST, 0x80), 0);
        data->gsGlobal->PrimAlphaEnable = GS_SETTING_ON;
        break;
    }
    case SDL_BLENDMODE_MUL:
    case SDL_BLENDMODE_MOD:
    {
        /* We don't fully support MOD and MUL, however this is the best we can do */
        gsKit_set_primalpha(data->gsGlobal, GS_SETREG_ALPHA(A_COLOR_DEST, A_COLOR_NULL, A_ALPHA_SOURCE, A_COLOR_SOURCE, 0x80), 0);
        data->gsGlobal->PrimAlphaEnable = GS_SETTING_ON;
        break;
    }
    }
}

static int PS2_RenderGeometry(SDL_Renderer *renderer, void *vertices, SDL_RenderCommand *cmd)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;
    const size_t count = cmd->data.draw.count;

    PS2_SetBlendMode(data, cmd->data.draw.blend);

    if (cmd->data.draw.texture) {
        const GSPRIMUVPOINT *verts = (GSPRIMUVPOINT *) (vertices + cmd->data.draw.first);
        GSTEXTURE *ps2_tex = (GSTEXTURE *)cmd->data.draw.texture->driverdata;

        gsKit_TexManager_bind(data->gsGlobal, ps2_tex);
        gsKit_prim_list_triangle_goraud_texture_uv_3d(data->gsGlobal, ps2_tex, count, verts);
    } else {
        const GSPRIMPOINT *verts = (GSPRIMPOINT *)(vertices + cmd->data.draw.first);
        gsKit_prim_list_triangle_gouraud_3d(data->gsGlobal, count, verts);
    }

    return 0;
}

int PS2_RenderLines(SDL_Renderer *renderer, void *vertices, SDL_RenderCommand *cmd)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;
    const size_t count = cmd->data.draw.count;
    const GSPRIMPOINT *verts = (GSPRIMPOINT *)(vertices + cmd->data.draw.first);

    PS2_SetBlendMode(data, cmd->data.draw.blend);
    gsKit_prim_list_line_goraud_3d(data->gsGlobal, count, verts);

    /* We're done! */
    return 0;
}

int PS2_RenderPoints(SDL_Renderer *renderer, void *vertices, SDL_RenderCommand *cmd)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;
    const size_t count = cmd->data.draw.count;
    const GSPRIMPOINT *verts = (GSPRIMPOINT *)(vertices + cmd->data.draw.first);

    PS2_SetBlendMode(data, cmd->data.draw.blend);
    gsKit_prim_list_points(data->gsGlobal, count, verts);

    /* We're done! */
    return 0;
}

static int PS2_RunCommandQueue(SDL_Renderer *renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize)
{
    while (cmd) {
        switch (cmd->command) {
        case SDL_RENDERCMD_SETVIEWPORT:
        {
            PS2_RenderSetViewPort(renderer, cmd);
            /* FIXME: We need to update the clip rect too, see https://github.com/libsdl-org/SDL/issues/9094 */
            break;
        }
        case SDL_RENDERCMD_SETCLIPRECT:
        {
            PS2_RenderSetClipRect(renderer, cmd);
            break;
        }
        case SDL_RENDERCMD_SETDRAWCOLOR:
        {
            PS2_RenderSetDrawColor(renderer, cmd);
            break;
        }
        case SDL_RENDERCMD_CLEAR:
        {
            PS2_RenderClear(renderer, cmd);
            break;
        }
        case SDL_RENDERCMD_DRAW_POINTS:
        {
            PS2_RenderPoints(renderer, vertices, cmd);
            break;
        }
        case SDL_RENDERCMD_DRAW_LINES:
        {
            PS2_RenderLines(renderer, vertices, cmd);
            break;
        }
        case SDL_RENDERCMD_FILL_RECTS: /* unused */
            break;
        case SDL_RENDERCMD_COPY: /* unused */
            break;
        case SDL_RENDERCMD_COPY_EX: /* unused */
            break;
        case SDL_RENDERCMD_GEOMETRY:
        {
            PS2_RenderGeometry(renderer, vertices, cmd);
            break;
        }
        case SDL_RENDERCMD_NO_OP:
            break;
        }
        cmd = cmd->next;
    }
    return 0;
}

static int PS2_RenderReadPixels(SDL_Renderer *renderer, const SDL_Rect *rect,
                                Uint32 format, void *pixels, int pitch)
{
    return SDL_Unsupported();
}

static int PS2_RenderPresent(SDL_Renderer *renderer)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;

    if (data->gsGlobal->DoubleBuffering == GS_SETTING_OFF) {
        if (data->vsync == 2) { // Dynamic
            gsKit_sync(data->gsGlobal);
        } else if (data->vsync == 1) {
            gsKit_vsync_wait();
        }
        gsKit_queue_exec(data->gsGlobal);
    } else {
        gsKit_queue_exec(data->gsGlobal);
        gsKit_finish();
        if (data->vsync == 2) { // Dynamic
            gsKit_sync(data->gsGlobal);
        } else if (data->vsync == 1) {
            gsKit_vsync_wait();
        }
        gsKit_flip(data->gsGlobal);
    }
    gsKit_TexManager_nextFrame(data->gsGlobal);
    gsKit_clear(data->gsGlobal, GS_BLACK);
    return 0;
}

static void PS2_DestroyTexture(SDL_Renderer *renderer, SDL_Texture *texture)
{
    GSTEXTURE *ps2_texture = (GSTEXTURE *)texture->driverdata;
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;

    if (!data) {
        return;
    }

    if (!ps2_texture) {
        return;
    }

    // Free from vram
    gsKit_TexManager_free(data->gsGlobal, ps2_texture);

    SDL_free(ps2_texture->Mem);
    SDL_free(ps2_texture);
    texture->driverdata = NULL;
}

static void PS2_DestroyRenderer(SDL_Renderer *renderer)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;

    if (data) {
        gsKit_clear(data->gsGlobal, GS_BLACK);
        gsKit_vram_clear(data->gsGlobal);
        gsKit_deinit_global(data->gsGlobal);
        gsKit_remove_vsync_handler(data->vsync_callback_id);

        SDL_free(data);
    }

    if (vsync_sema_id >= 0) {
        DeleteSema(vsync_sema_id);
    }
}

static int PS2_SetVSync(SDL_Renderer *renderer, const int vsync)
{
    PS2_RenderData *data = (PS2_RenderData *)renderer->driverdata;
    SDL_bool dynamicVsync = SDL_GetHintBoolean(SDL_HINT_PS2_DYNAMIC_VSYNC, SDL_FALSE);
    data->vsync = vsync ? (dynamicVsync ? 2 : 1) : 0;
    return 0;
}

static int PS2_CreateRenderer(SDL_Renderer *renderer, SDL_Window *window, Uint32 flags)
{
    PS2_RenderData *data;
    GSGLOBAL *gsGlobal;
    ee_sema_t sema;
    SDL_bool dynamicVsync;

    data = (PS2_RenderData *)SDL_calloc(1, sizeof(*data));
    if (!data) {
        PS2_DestroyRenderer(renderer);
        return SDL_OutOfMemory();
    }

    /* Specific gsKit init */
    sema.init_count = 0;
    sema.max_count = 1;
    sema.option = 0;
    vsync_sema_id = CreateSema(&sema);

    gsGlobal = gsKit_init_global_custom(RENDER_QUEUE_OS_POOLSIZE, RENDER_QUEUE_PER_POOLSIZE);

    gsGlobal->Mode = GS_MODE_NTSC;
    gsGlobal->Height = 448;

    gsGlobal->PSM = GS_PSM_CT24;
    gsGlobal->PSMZ = GS_PSMZ_16S;
    gsGlobal->ZBuffering = GS_SETTING_OFF;
    gsGlobal->DoubleBuffering = GS_SETTING_ON;
    gsGlobal->PrimAlphaEnable = GS_SETTING_ON;
    gsGlobal->Dithering = GS_SETTING_OFF;

    gsKit_set_primalpha(gsGlobal, GS_SETREG_ALPHA(0, 1, 0, 1, 0), 0);

    dmaKit_init(D_CTRL_RELE_OFF, D_CTRL_MFD_OFF, D_CTRL_STS_UNSPEC, D_CTRL_STD_OFF, D_CTRL_RCYC_8, 1 << DMA_CHANNEL_GIF);
    dmaKit_chan_init(DMA_CHANNEL_GIF);

    gsKit_set_clamp(gsGlobal, GS_CMODE_REPEAT);

    gsKit_vram_clear(gsGlobal);

    gsKit_init_screen(gsGlobal);

    gsKit_TexManager_init(gsGlobal);

    data->vsync_callback_id = gsKit_add_vsync_handler(vsync_handler);

    gsKit_mode_switch(gsGlobal, GS_ONESHOT);

    gsKit_clear(gsGlobal, GS_BLACK);

    data->gsGlobal = gsGlobal;
    dynamicVsync = SDL_GetHintBoolean(SDL_HINT_PS2_DYNAMIC_VSYNC, SDL_FALSE);
    data->vsync = flags & SDL_RENDERER_PRESENTVSYNC ? (dynamicVsync ? 2 : 1) : 0;

    renderer->WindowEvent = PS2_WindowEvent;
    renderer->CreateTexture = PS2_CreateTexture;
    renderer->UpdateTexture = PS2_UpdateTexture;
    renderer->LockTexture = PS2_LockTexture;
    renderer->UnlockTexture = PS2_UnlockTexture;
    renderer->SetTextureScaleMode = PS2_SetTextureScaleMode;
    renderer->SetRenderTarget = PS2_SetRenderTarget;
    renderer->QueueSetViewport = PS2_QueueSetViewport;
    renderer->QueueSetDrawColor = PS2_QueueSetDrawColor;
    renderer->QueueDrawPoints = PS2_QueueDrawPoints;
    renderer->QueueDrawLines = PS2_QueueDrawPoints;
    renderer->QueueGeometry = PS2_QueueGeometry;
    renderer->RunCommandQueue = PS2_RunCommandQueue;
    renderer->RenderReadPixels = PS2_RenderReadPixels;
    renderer->RenderPresent = PS2_RenderPresent;
    renderer->DestroyTexture = PS2_DestroyTexture;
    renderer->DestroyRenderer = PS2_DestroyRenderer;
    renderer->SetVSync = PS2_SetVSync;
    renderer->info = PS2_RenderDriver.info;
    renderer->driverdata = data;
    renderer->window = window;

    return 0;
}

SDL_RenderDriver PS2_RenderDriver = {
    .CreateRenderer = PS2_CreateRenderer,
    .info = {
        .name = "PS2 gsKit",
        .flags = SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE,
        .num_texture_formats = 2,
        .texture_formats = {
            [0] = SDL_PIXELFORMAT_ABGR1555,
            [1] = SDL_PIXELFORMAT_ABGR8888,
        },
        .max_texture_width = 1024,
        .max_texture_height = 1024,
    }
};

#endif /* SDL_VIDEO_RENDER_PS2 */

/* vi: set ts=4 sw=4 expandtab: */
