/*

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_ES

#include "SDL_video.h"

#include "SDL_opengles.h"

#include "SDL_sysvideo.h"

#include "SDL_pixels_c.h"

#include "SDL_rect_c.h"

#include "SDL_yuv_sw_c.h"

/* OpenGL ES 1.1 renderer implementation */

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_ES_RenderDriver = {

GL_CreateRenderer,

{

"opengl_es",

(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),

#ifdef GL_IMG_texture_format_BGRA8888

3,

#else

2,

#endif

{

#ifdef GL_IMG_texture_format_BGRA8888

SDL_PIXELFORMAT_ARGB8888,

#endif

SDL_PIXELFORMAT_RGB24,

SDL_PIXELFORMAT_ABGR8888,

},

0,

0}

};

typedef struct

{

SDL_GLContext context;

SDL_bool updateSize;

int blendMode;

int scaleMode;

#ifndef APIENTRY

#define APIENTRY

#endif

SDL_bool useDrawTexture;

SDL_bool GL_OES_draw_texture_supported;

/* OpenGL ES functions */

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

#include "SDL_glesfuncs.h"

#undef SDL_PROC

} GL_RenderData;

typedef struct

{

GLuint texture;

GLenum type;

GLfloat texw;

GLfloat texh;

GLenum format;

GLenum formattype;

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;

default:

error = "UNKNOWN";

break;

}

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

}

static int

GL_LoadFunctions(GL_RenderData * data)

{

#define SDL_PROC(ret,func,params) \

data->func = func;

#include "SDL_glesfuncs.h"

#undef SDL_PROC

return 0;

}

void

GL_AddRenderDriver(_THIS)

{

if (_this->GL_CreateContext) {

SDL_AddRenderDriver(0, &GL_ES_RenderDriver);

}

}

SDL_Renderer *

GL_CreateRenderer(SDL_Window * window, Uint32 flags)

{

printf("gl(es) create renderer ...\n");

SDL_Renderer *renderer;

GL_RenderData *data;

GLint value;

int doublebuffer;

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_ES_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;

}

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;

}

}

if (SDL_GL_ExtensionSupported("GL_OES_draw_texture")) {

printf("using draw texture\n");

data->GL_OES_draw_texture_supported = SDL_TRUE;

data->useDrawTexture = SDL_TRUE;

}

else {

printf("not using draw texture\n");

data->GL_OES_draw_texture_supported = SDL_FALSE;

data->useDrawTexture = SDL_FALSE;

}

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;

/* Set up parameters for rendering */

data->blendMode = -1;

data->scaleMode = -1;

data->glDisable(GL_DEPTH_TEST);

data->glDisable(GL_CULL_FACE);

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 (data->context == NULL) {

printf("Context is null, dude\n");

}

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->glOrthof(0.0, (GLfloat)window->w, (GLfloat)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:

case SDL_PIXELFORMAT_INDEX8:

case SDL_PIXELFORMAT_RGB332:

case SDL_PIXELFORMAT_RGB444:

case SDL_PIXELFORMAT_RGB555:

case SDL_PIXELFORMAT_ARGB4444:

case SDL_PIXELFORMAT_ARGB1555:

case SDL_PIXELFORMAT_BGR24:

case SDL_PIXELFORMAT_BGR888: /* can't convert 32 bit format to 24 */

case SDL_PIXELFORMAT_RGB888:

case SDL_PIXELFORMAT_RGBA8888:

case SDL_PIXELFORMAT_ARGB2101010:

SDL_SetError("Unsupported format");

return -1;

case SDL_PIXELFORMAT_ARGB8888:

#ifdef GL_IMG_texture_format_BGRA8888

internalFormat = GL_RGBA;

format = GL_RGBA;

type = GL_UNSIGNED_BYTE;

break;

#else

SDL_SetError("Unsupported format");

return -1;

#endif

case SDL_PIXELFORMAT_RGB24:

internalFormat = GL_RGB;

format = GL_RGB;

type = GL_UNSIGNED_BYTE;

break;

case SDL_PIXELFORMAT_ABGR8888:

internalFormat = GL_RGBA;

format = GL_RGBA;

type = GL_UNSIGNED_BYTE;

break;

/*

These formats would be supported if SDL had the necessary pixel formats

case SDL_PIXELFORMAT_BGR565:

internalFormat = GL_RGB;

format = GL_RGB;

type = GL_UNSIGNED_SHORT_5_6_5;

break;

case SDL_PIXELFORMAT_ABGR5551:

internalFormat = GL_RGBA;

format = GL_RGBA;

type = GL_UNSIGNED_SHORT_5_5_5_1;

break;

case SDL_PIXELFORMAT_ABGR4444:

internalFormat = GL_RGBA;

format = GL_RGBA;

type = GL_UNSIGNED_SHORT_4_4_4_4;

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->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);

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);

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)

{

SDL_SetError("OpenGL ES does not support paletted textures");

return -1;

}

static int

GL_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,

SDL_Color * colors, int firstcolor, int ncolors)

{

SDL_SetError("OpenGL ES does not support paletted textures");

return -1;

}

static void

SetupTextureUpdate(GL_RenderData * renderdata, SDL_Texture * texture,

int pitch)

{

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

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

renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

}

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;

SetupTextureUpdate(renderdata, texture, pitch);

renderdata->glGetError();

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);

/* set proper drawing color */

GLfloat oldClearColor[4];

data->glGetFloatv(GL_COLOR_CLEAR_VALUE, oldClearColor);

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

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

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

data->glEnable(GL_SCISSOR_TEST);

data->glClear(GL_COLOR_BUFFER_BIT);

data->glDisable(GL_SCISSOR_TEST);

/* reset clear color */

data->glClearColor(oldClearColor[0], oldClearColor[1], oldClearColor[2], oldClearColor[2]);

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;

int i;

void *temp_buffer; /* used for reformatting dirty rect pixels */

void *temp_ptr;

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);

/* There is no GL_UNPACK_ROW_LENGTH in OpenGLES

we must do this reformatting ourselves(!)

maybe it'd be a good idea to keep a temp buffer around

for this purpose rather than allocating it each time

*/

temp_buffer = SDL_malloc(rect->w * rect->h * bpp);

temp_ptr = temp_buffer;

for (i=0; i<rect->h; i++) {

SDL_memcpy(temp_ptr, pixels, rect->w * bpp);

temp_ptr += rect->w * bpp;

pixels += pitch;

}

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

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

texturedata->formattype, temp_buffer);

SDL_free(temp_buffer);

}

SDL_ClearDirtyRects(&texturedata->dirty);

}

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

data->glEnable(GL_TEXTURE_2D);

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;

//}

if (data->GL_OES_draw_texture_supported && data->useDrawTexture) {

/* this code is a little funny because the viewport is upside down vs SDL's coordinate system */

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

GLint cropRect[4];

cropRect[0] = srcrect->x;

cropRect[1] = srcrect->y + srcrect->h;

cropRect[2] = srcrect->w;

cropRect[3] = -srcrect->h;

data->glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, cropRect);

data->glDrawTexiOES(dstrect->x, window->h - dstrect->y - dstrect->h, 0, dstrect->w, dstrect->h);

}

else {

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;

GLshort vertices[8];

GLfloat texCoords[8];

vertices[0] = minx; vertices[1] = miny;

vertices[2] = maxx; vertices[3] = miny;

vertices[4] = minx; vertices[5] = maxy;

vertices[6] = maxx; vertices[7] = maxy;

texCoords[0] = minu; texCoords[1] = minv;

texCoords[2] = maxu; texCoords[3] = minv;

texCoords[4] = minu; texCoords[5] = maxv;

texCoords[6] = maxu; texCoords[7] = maxv;

data->glVertexPointer(2, GL_SHORT, 0, vertices);

data->glEnableClientState(GL_VERTEX_ARRAY);

data->glTexCoordPointer(2, GL_FLOAT, 0, texCoords);

data->glEnableClientState(GL_TEXTURE_COORD_ARRAY);

data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

}

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) {

glDeleteTextures(1, &data->texture);

}

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); *//* doesn't do anything */

SDL_GL_DeleteContext(data->context);

}

SDL_free(data);

}

SDL_free(renderer);

}

#endif /* SDL_VIDEO_RENDER_OGL */

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