/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

slouken@libsdl.org

*/

#include "SDL_config.h"

#if SDL_VIDEO_RENDER_OGL

#include "SDL_video.h"

#include "SDL_opengl.h"

#include "SDL_sysvideo.h"

#include "SDL_pixels_c.h"

#include "SDL_rect_c.h"

#include "SDL_yuv_sw_c.h"

#ifdef __MACOSX__

#include <OpenGL/OpenGL.h>

#endif

/* OpenGL renderer implementation */

/* Details on optimizing the texture path on Mac OS X:

http://developer.apple.com/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_texturedata/chapter_10_section_2.html

*/

static const float inv255f = 1.0f / 255.0f;

static SDL_Renderer *GL_CreateRenderer(SDL_Window * window, Uint32 flags);

static int GL_ActivateRenderer(SDL_Renderer * renderer);

static int GL_DisplayModeChanged(SDL_Renderer * renderer);

static int GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static int GL_QueryTexturePixels(SDL_Renderer * renderer,

SDL_Texture * texture, void **pixels,

int *pitch);

static int GL_SetTexturePalette(SDL_Renderer * renderer,

SDL_Texture * texture,

const SDL_Color * colors, int firstcolor,

int ncolors);

static int GL_GetTexturePalette(SDL_Renderer * renderer,

SDL_Texture * texture, SDL_Color * colors,

int firstcolor, int ncolors);

static int GL_SetTextureColorMod(SDL_Renderer * renderer,

SDL_Texture * texture);

static int GL_SetTextureAlphaMod(SDL_Renderer * renderer,

SDL_Texture * texture);

static int GL_SetTextureBlendMode(SDL_Renderer * renderer,

SDL_Texture * texture);

static int GL_SetTextureScaleMode(SDL_Renderer * renderer,

SDL_Texture * texture);

static int GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, const void *pixels,

int pitch);

static int GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, int markDirty, void **pixels,

int *pitch);

static void GL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static void GL_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,

int numrects, const SDL_Rect * rects);

static int GL_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g, Uint8 b,

Uint8 a, const SDL_Rect * rect);

static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * srcrect, const SDL_Rect * dstrect);

static void GL_RenderPresent(SDL_Renderer * renderer);

static void GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static void GL_DestroyRenderer(SDL_Renderer * renderer);

SDL_RenderDriver GL_RenderDriver = {

GL_CreateRenderer,

{

"opengl",

(SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTDISCARD |

SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED),

(SDL_TEXTUREMODULATE_NONE | SDL_TEXTUREMODULATE_COLOR |

SDL_TEXTUREMODULATE_ALPHA),

(SDL_TEXTUREBLENDMODE_NONE | SDL_TEXTUREBLENDMODE_MASK |

SDL_TEXTUREBLENDMODE_BLEND | SDL_TEXTUREBLENDMODE_ADD |

SDL_TEXTUREBLENDMODE_MOD),

(SDL_TEXTURESCALEMODE_NONE | SDL_TEXTURESCALEMODE_FAST |

SDL_TEXTURESCALEMODE_SLOW),

16,

{

SDL_PIXELFORMAT_INDEX1LSB,

SDL_PIXELFORMAT_INDEX1MSB,

SDL_PIXELFORMAT_INDEX8,

SDL_PIXELFORMAT_RGB332,

SDL_PIXELFORMAT_RGB444,

SDL_PIXELFORMAT_RGB555,

SDL_PIXELFORMAT_ARGB4444,

SDL_PIXELFORMAT_ARGB1555,

SDL_PIXELFORMAT_RGB565,

SDL_PIXELFORMAT_RGB24,

SDL_PIXELFORMAT_BGR24,

SDL_PIXELFORMAT_RGB888,

SDL_PIXELFORMAT_BGR888,

SDL_PIXELFORMAT_ARGB8888,

SDL_PIXELFORMAT_ABGR8888,

SDL_PIXELFORMAT_ARGB2101010},

0,

0}

};

typedef struct

{

SDL_GLContext context;

SDL_bool updateSize;

SDL_bool GL_ARB_texture_rectangle_supported;

SDL_bool GL_EXT_paletted_texture_supported;

int blendMode;

int scaleMode;

/* OpenGL functions */

#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;

#include "SDL_glfuncs.h"

#undef SDL_PROC

PFNGLCOLORTABLEEXTPROC glColorTableEXT;

void (*glTextureRangeAPPLE) (GLenum target, GLsizei length,

const GLvoid * pointer);

} GL_RenderData;

typedef struct

{

GLuint texture;

GLenum type;

GLfloat texw;

GLfloat texh;

GLenum format;

GLenum formattype;

Uint8 *palette;

void *pixels;

int pitch;

SDL_DirtyRectList dirty;

} GL_TextureData;

static void

GL_SetError(const char *prefix, GLenum result)

{

const char *error;

switch (result) {

case GL_NO_ERROR:

error = "GL_NO_ERROR";

break;

case GL_INVALID_ENUM:

error = "GL_INVALID_ENUM";

break;

case GL_INVALID_VALUE:

error = "GL_INVALID_VALUE";

break;

case GL_INVALID_OPERATION:

error = "GL_INVALID_OPERATION";

break;

case GL_STACK_OVERFLOW:

error = "GL_STACK_OVERFLOW";

break;

case GL_STACK_UNDERFLOW:

error = "GL_STACK_UNDERFLOW";

break;

case GL_OUT_OF_MEMORY:

error = "GL_OUT_OF_MEMORY";

break;

case GL_TABLE_TOO_LARGE:

error = "GL_TABLE_TOO_LARGE";

break;

default:

error = "UNKNOWN";

break;

}

SDL_SetError("%s: %s", prefix, error);

}

static int

GL_LoadFunctions(GL_RenderData * data)

{

#if defined(__QNXNTO__) && (_NTO_VERSION < 630)

#define __SDL_NOGETPROCADDR__

#elif defined(__MINT__)

#define __SDL_NOGETPROCADDR__

#endif

#ifdef __SDL_NOGETPROCADDR__

#define SDL_PROC(ret,func,params) data->func=func;

#else

#define SDL_PROC(ret,func,params) \

do { \

data->func = SDL_GL_GetProcAddress(#func); \

if ( ! data->func ) { \

SDL_SetError("Couldn't load GL function %s: %s\n", #func, SDL_GetError()); \

return -1; \

} \

} while ( 0 );

#endif /* __SDL_NOGETPROCADDR__ */

#include "SDL_glfuncs.h"

#undef SDL_PROC

return 0;

}

void

GL_AddRenderDriver(_THIS)

{

if (_this->GL_CreateContext) {

SDL_AddRenderDriver(0, &GL_RenderDriver);

}

}

SDL_Renderer *

GL_CreateRenderer(SDL_Window * window, Uint32 flags)

{

SDL_Renderer *renderer;

GL_RenderData *data;

GLint value;

int doublebuffer;

/* Render directly to the window, unless we're compositing */

#ifndef __MACOSX__

if (flags & SDL_RENDERER_SINGLEBUFFER) {

SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 0);

}

#endif

if (!(window->flags & SDL_WINDOW_OPENGL)) {

if (SDL_RecreateWindow(window, window->flags | SDL_WINDOW_OPENGL) < 0) {

return NULL;

}

}

renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));

if (!renderer) {

SDL_OutOfMemory();

return NULL;

}

data = (GL_RenderData *) SDL_calloc(1, sizeof(*data));

if (!data) {

GL_DestroyRenderer(renderer);

SDL_OutOfMemory();

return NULL;

}

renderer->ActivateRenderer = GL_ActivateRenderer;

renderer->DisplayModeChanged = GL_DisplayModeChanged;

renderer->CreateTexture = GL_CreateTexture;

renderer->QueryTexturePixels = GL_QueryTexturePixels;

renderer->SetTexturePalette = GL_SetTexturePalette;

renderer->GetTexturePalette = GL_GetTexturePalette;

renderer->SetTextureColorMod = GL_SetTextureColorMod;

renderer->SetTextureAlphaMod = GL_SetTextureAlphaMod;

renderer->SetTextureBlendMode = GL_SetTextureBlendMode;

renderer->SetTextureScaleMode = GL_SetTextureScaleMode;

renderer->UpdateTexture = GL_UpdateTexture;

renderer->LockTexture = GL_LockTexture;

renderer->UnlockTexture = GL_UnlockTexture;

renderer->DirtyTexture = GL_DirtyTexture;

renderer->RenderFill = GL_RenderFill;

renderer->RenderCopy = GL_RenderCopy;

renderer->RenderPresent = GL_RenderPresent;

renderer->DestroyTexture = GL_DestroyTexture;

renderer->DestroyRenderer = GL_DestroyRenderer;

renderer->info = GL_RenderDriver.info;

renderer->window = window->id;

renderer->driverdata = data;

renderer->info.flags =

(SDL_RENDERER_PRESENTDISCARD | SDL_RENDERER_ACCELERATED);

if (GL_LoadFunctions(data) < 0) {

GL_DestroyRenderer(renderer);

return NULL;

}

data->context = SDL_GL_CreateContext(window->id);

if (!data->context) {

GL_DestroyRenderer(renderer);

return NULL;

}

if (SDL_GL_MakeCurrent(window->id, data->context) < 0) {

GL_DestroyRenderer(renderer);

return NULL;

}

#ifdef __MACOSX__

/* Enable multi-threaded rendering */

/* Disabled until Ryan finishes his VBO/PBO code...

CGLEnable(CGLGetCurrentContext(), kCGLCEMPEngine);

*/

#endif

if (flags & SDL_RENDERER_PRESENTVSYNC) {

SDL_GL_SetSwapInterval(1);

} else {

SDL_GL_SetSwapInterval(0);

}

if (SDL_GL_GetSwapInterval() > 0) {

renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;

}

if (SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER, &doublebuffer) == 0) {

if (!doublebuffer) {

renderer->info.flags |= SDL_RENDERER_SINGLEBUFFER;

}

}

data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);

renderer->info.max_texture_width = value;

data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);

renderer->info.max_texture_height = value;

if (SDL_GL_ExtensionSupported("GL_ARB_texture_rectangle")

|| SDL_GL_ExtensionSupported("GL_EXT_texture_rectangle")) {

data->GL_ARB_texture_rectangle_supported = SDL_TRUE;

}

if (SDL_GL_ExtensionSupported("GL_EXT_paletted_texture")) {

data->GL_EXT_paletted_texture_supported = SDL_TRUE;

data->glColorTableEXT =

(PFNGLCOLORTABLEEXTPROC) SDL_GL_GetProcAddress("glColorTableEXT");

} else {

/* Don't advertise support for 8-bit indexed texture format */

Uint32 i, j;

SDL_RendererInfo *info = &renderer->info;

for (i = 0, j = 0; i < info->num_texture_formats; ++i) {

if (info->texture_formats[i] != SDL_PIXELFORMAT_INDEX8) {

info->texture_formats[j++] = info->texture_formats[i];

}

}

--info->num_texture_formats;

}

if (SDL_GL_ExtensionSupported("GL_APPLE_texture_range")) {

data->glTextureRangeAPPLE =

(void (*)(GLenum, GLsizei, const GLvoid *))

SDL_GL_GetProcAddress("glTextureRangeAPPLE");

}

/* Set up parameters for rendering */

data->blendMode = -1;

data->scaleMode = -1;

data->glDisable(GL_DEPTH_TEST);

data->glDisable(GL_CULL_FACE);

if (data->GL_ARB_texture_rectangle_supported) {

data->glEnable(GL_TEXTURE_RECTANGLE_ARB);

} else {

data->glEnable(GL_TEXTURE_2D);

}

data->updateSize = SDL_TRUE;

return renderer;

}

static int

GL_ActivateRenderer(SDL_Renderer * renderer)

{

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

SDL_Window *window = SDL_GetWindowFromID(renderer->window);

if (SDL_GL_MakeCurrent(window->id, data->context) < 0) {

return -1;

}

if (data->updateSize) {

data->glMatrixMode(GL_PROJECTION);

data->glLoadIdentity();

data->glMatrixMode(GL_MODELVIEW);

data->glLoadIdentity();

data->glViewport(0, 0, window->w, window->h);

data->glOrtho(0.0, (GLdouble) window->w, (GLdouble) window->h, 0.0,

0.0, 1.0);

data->updateSize = SDL_FALSE;

}

return 0;

}

static int

GL_DisplayModeChanged(SDL_Renderer * renderer)

{

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

data->updateSize = SDL_TRUE;

return 0;

}

static __inline__ int

power_of_2(int input)

{

int value = 1;

while (value < input) {

value <<= 1;

}

return value;

}

static int

GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

SDL_Window *window = SDL_GetWindowFromID(renderer->window);

GL_TextureData *data;

GLint internalFormat;

GLenum format, type;

int texture_w, texture_h;

GLenum result;

switch (texture->format) {

case SDL_PIXELFORMAT_INDEX1LSB:

case SDL_PIXELFORMAT_INDEX1MSB:

internalFormat = GL_RGB;

format = GL_COLOR_INDEX;

type = GL_BITMAP;

break;

case SDL_PIXELFORMAT_INDEX8:

if (!renderdata->GL_EXT_paletted_texture_supported) {

SDL_SetError("Unsupported texture format");

return -1;

}

internalFormat = GL_COLOR_INDEX8_EXT;

format = GL_COLOR_INDEX;

type = GL_UNSIGNED_BYTE;

break;

case SDL_PIXELFORMAT_RGB332:

internalFormat = GL_R3_G3_B2;

format = GL_RGB;

type = GL_UNSIGNED_BYTE_3_3_2;

break;

case SDL_PIXELFORMAT_RGB444:

internalFormat = GL_RGB4;

format = GL_RGB;

type = GL_UNSIGNED_SHORT_4_4_4_4;

break;

case SDL_PIXELFORMAT_RGB555:

internalFormat = GL_RGB5;

format = GL_RGB;

type = GL_UNSIGNED_SHORT_5_5_5_1;

break;

case SDL_PIXELFORMAT_ARGB4444:

internalFormat = GL_RGBA4;

format = GL_BGRA;

type = GL_UNSIGNED_SHORT_4_4_4_4_REV;

break;

case SDL_PIXELFORMAT_ARGB1555:

internalFormat = GL_RGB5_A1;

format = GL_BGRA;

type = GL_UNSIGNED_SHORT_1_5_5_5_REV;

break;

case SDL_PIXELFORMAT_RGB565:

internalFormat = GL_RGB8;

format = GL_RGB;

type = GL_UNSIGNED_SHORT_5_6_5;

break;

case SDL_PIXELFORMAT_RGB24:

internalFormat = GL_RGB8;

format = GL_RGB;

type = GL_UNSIGNED_BYTE;

break;

case SDL_PIXELFORMAT_RGB888:

internalFormat = GL_RGB8;

format = GL_BGRA;

type = GL_UNSIGNED_BYTE;

break;

case SDL_PIXELFORMAT_BGR24:

internalFormat = GL_RGB8;

format = GL_BGR;

type = GL_UNSIGNED_BYTE;

break;

case SDL_PIXELFORMAT_BGR888:

internalFormat = GL_RGB8;

format = GL_RGBA;

type = GL_UNSIGNED_BYTE;

break;

case SDL_PIXELFORMAT_ARGB8888:

#ifdef __MACOSX__

internalFormat = GL_RGBA;

format = GL_BGRA;

type = GL_UNSIGNED_INT_8_8_8_8_REV;

#else

internalFormat = GL_RGBA8;

format = GL_BGRA;

type = GL_UNSIGNED_BYTE;

#endif

break;

case SDL_PIXELFORMAT_ABGR8888:

internalFormat = GL_RGBA8;

format = GL_RGBA;

type = GL_UNSIGNED_BYTE;

break;

case SDL_PIXELFORMAT_ARGB2101010:

internalFormat = GL_RGB10_A2;

format = GL_BGRA;

type = GL_UNSIGNED_INT_2_10_10_10_REV;

break;

default:

SDL_SetError("Unsupported texture format");

return -1;

}

data = (GL_TextureData *) SDL_calloc(1, sizeof(*data));

if (!data) {

SDL_OutOfMemory();

return -1;

}

if (texture->format == SDL_PIXELFORMAT_INDEX8) {

data->palette = (Uint8 *) SDL_malloc(3 * 256 * sizeof(Uint8));

if (!data->palette) {

SDL_OutOfMemory();

SDL_free(data);

return -1;

}

SDL_memset(data->palette, 0xFF, 3 * 256 * sizeof(Uint8));

}

if (texture->access == SDL_TEXTUREACCESS_STREAMING) {

data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);

data->pixels = SDL_malloc(texture->h * data->pitch);

if (!data->pixels) {

SDL_OutOfMemory();

SDL_free(data);

return -1;

}

}

texture->driverdata = data;

renderdata->glGetError();

renderdata->glGenTextures(1, &data->texture);

if (renderdata->GL_ARB_texture_rectangle_supported) {

data->type = GL_TEXTURE_RECTANGLE_ARB;

texture_w = texture->w;

texture_h = texture->h;

data->texw = (GLfloat) texture->w;

data->texh = (GLfloat) texture->h;

} else {

data->type = GL_TEXTURE_2D;

texture_w = power_of_2(texture->w);

texture_h = power_of_2(texture->h);

data->texw = (GLfloat) texture->w / texture_w;

data->texh = (GLfloat) texture->h / texture_h;

}

data->format = format;

data->formattype = type;

renderdata->glBindTexture(data->type, data->texture);

renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER,

GL_NEAREST);

renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER,

GL_NEAREST);

renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_S,

GL_CLAMP_TO_EDGE);

renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_T,

GL_CLAMP_TO_EDGE);

#ifdef __MACOSX__

#ifndef GL_TEXTURE_STORAGE_HINT_APPLE

#define GL_TEXTURE_STORAGE_HINT_APPLE 0x85BC

#endif

#ifndef STORAGE_CACHED_APPLE

#define STORAGE_CACHED_APPLE 0x85BE

#endif

#ifndef STORAGE_SHARED_APPLE

#define STORAGE_SHARED_APPLE 0x85BF

#endif

if (texture->access == SDL_TEXTUREACCESS_STREAMING) {

renderdata->glTexParameteri(data->type, GL_TEXTURE_STORAGE_HINT_APPLE,

GL_STORAGE_SHARED_APPLE);

} else {

renderdata->glTexParameteri(data->type, GL_TEXTURE_STORAGE_HINT_APPLE,

GL_STORAGE_CACHED_APPLE);

}

if (texture->access == SDL_TEXTUREACCESS_STREAMING

&& texture->format == SDL_PIXELFORMAT_ARGB8888) {

/*

if (renderdata->glTextureRangeAPPLE) {

renderdata->glTextureRangeAPPLE(data->type,

texture->h * data->pitch,

data->pixels);

}

*/

renderdata->glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);

renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,

texture_h, 0, format, type, data->pixels);

} else

#endif

{

renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,

texture_h, 0, format, type, NULL);

}

result = renderdata->glGetError();

if (result != GL_NO_ERROR) {

GL_SetError("glTexImage2D()", result);

return -1;

}

return 0;

}

static int

GL_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,

void **pixels, int *pitch)

{

GL_TextureData *data = (GL_TextureData *) texture->driverdata;

*pixels = data->pixels;

*pitch = data->pitch;

return 0;

}

static int

GL_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Color * colors, int firstcolor, int ncolors)

{

GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

GL_TextureData *data = (GL_TextureData *) texture->driverdata;

Uint8 *palette;

if (!data->palette) {

SDL_SetError("Texture doesn't have a palette");

return -1;

}

palette = data->palette + firstcolor * 3;

while (ncolors--) {

*palette++ = colors->r;

*palette++ = colors->g;

*palette++ = colors->b;

++colors;

}

renderdata->glBindTexture(data->type, data->texture);

renderdata->glColorTableEXT(data->type, GL_RGB8, 256, GL_RGB,

GL_UNSIGNED_BYTE, data->palette);

return 0;

}

static int

GL_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

SDL_Color * colors, int firstcolor, int ncolors)

{

GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

GL_TextureData *data = (GL_TextureData *) texture->driverdata;

Uint8 *palette;

if (!data->palette) {

SDL_SetError("Texture doesn't have a palette");

return -1;

}

palette = data->palette + firstcolor * 3;

while (ncolors--) {

colors->r = *palette++;

colors->g = *palette++;

colors->b = *palette++;

colors->unused = SDL_ALPHA_OPAQUE;

++colors;

}

return 0;

}

static void

SetupTextureUpdate(GL_RenderData * renderdata, SDL_Texture * texture,

int pitch)

{

if (texture->format == SDL_PIXELFORMAT_INDEX1LSB) {

renderdata->glPixelStorei(GL_UNPACK_LSB_FIRST, 1);

} else if (texture->format == SDL_PIXELFORMAT_INDEX1MSB) {

renderdata->glPixelStorei(GL_UNPACK_LSB_FIRST, 0);

}

renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH,

pitch / SDL_BYTESPERPIXEL(texture->format));

}

static int

GL_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)

{

return 0;

}

static int

GL_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)

{

return 0;

}

static int

GL_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)

{

switch (texture->blendMode) {

case SDL_TEXTUREBLENDMODE_NONE:

case SDL_TEXTUREBLENDMODE_MASK:

case SDL_TEXTUREBLENDMODE_BLEND:

case SDL_TEXTUREBLENDMODE_ADD:

case SDL_TEXTUREBLENDMODE_MOD:

return 0;

default:

SDL_Unsupported();

texture->blendMode = SDL_TEXTUREBLENDMODE_NONE;

return -1;

}

}

static int

GL_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture)

{

switch (texture->scaleMode) {

case SDL_TEXTURESCALEMODE_NONE:

case SDL_TEXTURESCALEMODE_FAST:

case SDL_TEXTURESCALEMODE_SLOW:

return 0;

case SDL_TEXTURESCALEMODE_BEST:

SDL_Unsupported();

texture->scaleMode = SDL_TEXTURESCALEMODE_SLOW;

return -1;

default:

SDL_Unsupported();

texture->scaleMode = SDL_TEXTURESCALEMODE_NONE;

return -1;

}

}

static int

GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, const void *pixels, int pitch)

{

GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

GL_TextureData *data = (GL_TextureData *) texture->driverdata;

GLenum result;

renderdata->glGetError();

SetupTextureUpdate(renderdata, texture, pitch);

renderdata->glBindTexture(data->type, data->texture);

renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,

rect->h, data->format, data->formattype,

pixels);

result = renderdata->glGetError();

if (result != GL_NO_ERROR) {

GL_SetError("glTexSubImage2D()", result);

return -1;

}

return 0;

}

static int

GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, int markDirty, void **pixels,

int *pitch)

{

GL_TextureData *data = (GL_TextureData *) texture->driverdata;

if (markDirty) {

SDL_AddDirtyRect(&data->dirty, rect);

}

*pixels =

(void *) ((Uint8 *) data->pixels + rect->y * data->pitch +

rect->x * SDL_BYTESPERPIXEL(texture->format));

*pitch = data->pitch;

return 0;

}

static void

GL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

}

static void

GL_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture, int numrects,

const SDL_Rect * rects)

{

GL_TextureData *data = (GL_TextureData *) texture->driverdata;

int i;

for (i = 0; i < numrects; ++i) {

SDL_AddDirtyRect(&data->dirty, &rects[i]);

}

}

static int

GL_RenderFill(SDL_Renderer * renderer, Uint8 r, Uint8 g, Uint8 b, Uint8 a,

const SDL_Rect * rect)

{

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

SDL_Window *window = SDL_GetWindowFromID(renderer->window);

data->glClearColor((GLclampf) r * inv255f, (GLclampf) g * inv255f,

(GLclampf) b * inv255f, (GLclampf) a * inv255f);

data->glViewport(rect->x, window->h - rect->y, rect->w, rect->h);

data->glClear(GL_COLOR_BUFFER_BIT);

data->glViewport(0, 0, window->w, window->h);

return 0;

}

static int

GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * srcrect, const SDL_Rect * dstrect)

{

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

GL_TextureData *texturedata = (GL_TextureData *) texture->driverdata;

int minx, miny, maxx, maxy;

GLfloat minu, maxu, minv, maxv;

if (texturedata->dirty.list) {

SDL_DirtyRect *dirty;

void *pixels;

int bpp = SDL_BYTESPERPIXEL(texture->format);

int pitch = texturedata->pitch;

SetupTextureUpdate(data, texture, pitch);

data->glBindTexture(texturedata->type, texturedata->texture);

for (dirty = texturedata->dirty.list; dirty; dirty = dirty->next) {

SDL_Rect *rect = &dirty->rect;

pixels =

(void *) ((Uint8 *) texturedata->pixels + rect->y * pitch +

rect->x * bpp);

data->glTexSubImage2D(texturedata->type, 0, rect->x, rect->y,

rect->w, rect->h, texturedata->format,

texturedata->formattype, pixels);

}

SDL_ClearDirtyRects(&texturedata->dirty);

}

minx = dstrect->x;

miny = dstrect->y;

maxx = dstrect->x + dstrect->w;

maxy = dstrect->y + dstrect->h;

minu = (GLfloat) srcrect->x / texture->w;

minu *= texturedata->texw;

maxu = (GLfloat) (srcrect->x + srcrect->w) / texture->w;

maxu *= texturedata->texw;

minv = (GLfloat) srcrect->y / texture->h;

minv *= texturedata->texh;

maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;

maxv *= texturedata->texh;

data->glBindTexture(texturedata->type, texturedata->texture);

if (texture->modMode) {

data->glColor4f((GLfloat) texture->r * inv255f,

(GLfloat) texture->g * inv255f,

(GLfloat) texture->b * inv255f,

(GLfloat) texture->a * inv255f);

} else {

data->glColor4f(1.0f, 1.0f, 1.0f, 1.0f);

}

if (texture->blendMode != data->blendMode) {

switch (texture->blendMode) {

case SDL_TEXTUREBLENDMODE_NONE:

data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);

data->glDisable(GL_BLEND);

break;

case SDL_TEXTUREBLENDMODE_MASK:

case SDL_TEXTUREBLENDMODE_BLEND:

data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

data->glEnable(GL_BLEND);

data->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

break;

case SDL_TEXTUREBLENDMODE_ADD:

data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

data->glEnable(GL_BLEND);

data->glBlendFunc(GL_SRC_ALPHA, GL_ONE);

break;

case SDL_TEXTUREBLENDMODE_MOD:

data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

data->glEnable(GL_BLEND);

data->glBlendFunc(GL_ZERO, GL_SRC_COLOR);

break;

}

data->blendMode = texture->blendMode;

}

if (texture->scaleMode != data->scaleMode) {

switch (texture->scaleMode) {

case SDL_TEXTURESCALEMODE_NONE:

case SDL_TEXTURESCALEMODE_FAST:

data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,

GL_NEAREST);

data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,

GL_NEAREST);

break;

case SDL_TEXTURESCALEMODE_SLOW:

case SDL_TEXTURESCALEMODE_BEST:

data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,

GL_LINEAR);

data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,

GL_LINEAR);

break;

}

data->scaleMode = texture->scaleMode;

}

data->glBegin(GL_TRIANGLE_STRIP);

data->glTexCoord2f(minu, minv);

data->glVertex2i(minx, miny);

data->glTexCoord2f(maxu, minv);

data->glVertex2i(maxx, miny);

data->glTexCoord2f(minu, maxv);

data->glVertex2i(minx, maxy);

data->glTexCoord2f(maxu, maxv);

data->glVertex2i(maxx, maxy);

data->glEnd();

return 0;

}

static void

GL_RenderPresent(SDL_Renderer * renderer)

{

SDL_GL_SwapWindow(renderer->window);

}

static void

GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;

GL_TextureData *data = (GL_TextureData *) texture->driverdata;

if (!data) {

return;

}

if (data->texture) {

renderdata->glDeleteTextures(1, &data->texture);

}

if (data->palette) {

SDL_free(data->palette);

}

if (data->pixels) {

SDL_free(data->pixels);

}

SDL_FreeDirtyRects(&data->dirty);

SDL_free(data);

texture->driverdata = NULL;

}

static void

GL_DestroyRenderer(SDL_Renderer * renderer)

{

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

if (data) {

if (data->context) {

SDL_GL_MakeCurrent(0, NULL);

SDL_GL_DeleteContext(data->context);

}

SDL_free(data);

}

SDL_free(renderer);

}

#endif /* SDL_VIDEO_RENDER_OGL */

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