This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_renderer_gles.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2010 Sam Lantinga
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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"
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#if defined(__QNXNTO__)
/* Include QNX system header to check QNX version later */
#include <sys/neutrino.h>
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#endif /* __QNXNTO__ */
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#if defined(SDL_VIDEO_DRIVER_QNXGF) || \
defined(SDL_VIDEO_DRIVER_PHOTON) || \
defined(SDL_VIDEO_DRIVER_PANDORA)
/* Empty function stub to get OpenGL ES 1.x support without */
/* OpenGL ES extension GL_OES_draw_texture supported */
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GL_API void GL_APIENTRY
glDrawTexiOES(GLint x, GLint y, GLint z, GLint width, GLint height)
{
return;
}
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#endif /* QNXGF || PHOTON || PANDORA */
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/* OpenGL ES 1.1 renderer implementation, based on the OpenGL renderer */
static const float inv255f = 1.0f / 255.0f;
static SDL_Renderer *GLES_CreateRenderer(SDL_Window * window, Uint32 flags);
static int GLES_ActivateRenderer(SDL_Renderer * renderer);
static int GLES_DisplayModeChanged(SDL_Renderer * renderer);
static int GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int GLES_QueryTexturePixels(SDL_Renderer * renderer,
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SDL_Texture * texture, void **pixels,
int *pitch);
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static int GLES_SetTexturePalette(SDL_Renderer * renderer,
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SDL_Texture * texture,
const SDL_Color * colors, int firstcolor,
int ncolors);
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static int GLES_GetTexturePalette(SDL_Renderer * renderer,
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SDL_Texture * texture, SDL_Color * colors,
int firstcolor, int ncolors);
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static int GLES_SetTextureColorMod(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static int GLES_SetTextureAlphaMod(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static int GLES_SetTextureBlendMode(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static int GLES_SetTextureScaleMode(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static int GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * rect, const void *pixels,
int pitch);
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static int GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * rect, int markDirty,
void **pixels, int *pitch);
static void GLES_UnlockTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
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static void GLES_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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int numrects, const SDL_Rect * rects);
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static int GLES_RenderDrawPoints(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int GLES_RenderDrawLines(SDL_Renderer * renderer,
const SDL_Point * points, int count);
static int GLES_RenderDrawRects(SDL_Renderer * renderer,
const SDL_Rect ** rects, int count);
static int GLES_RenderFillRects(SDL_Renderer * renderer,
const SDL_Rect ** rects, int count);
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static int GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect,
const SDL_Rect * dstrect);
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static void GLES_RenderPresent(SDL_Renderer * renderer);
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static void GLES_DestroyTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
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static void GLES_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver GL_ES_RenderDriver = {
GLES_CreateRenderer,
{
"opengl_es",
(SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTDISCARD |
SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED),
(SDL_TEXTUREMODULATE_NONE | SDL_TEXTUREMODULATE_COLOR |
SDL_TEXTUREMODULATE_ALPHA),
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(SDL_BLENDMODE_NONE | SDL_BLENDMODE_MASK |
SDL_BLENDMODE_BLEND | SDL_BLENDMODE_ADD | SDL_BLENDMODE_MOD),
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(SDL_SCALEMODE_NONE | SDL_SCALEMODE_FAST | SDL_SCALEMODE_SLOW), 6,
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{
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/* OpenGL ES 1.x supported formats list */
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SDL_PIXELFORMAT_RGBA4444,
SDL_PIXELFORMAT_RGBA5551,
SDL_PIXELFORMAT_RGB565,
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SDL_PIXELFORMAT_RGB24,
SDL_PIXELFORMAT_BGR888,
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SDL_PIXELFORMAT_ABGR8888},
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0,
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0}
};
typedef struct
{
SDL_GLContext context;
SDL_bool updateSize;
int blendMode;
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#ifndef APIENTRY
#define APIENTRY
#endif
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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
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} GLES_RenderData;
typedef struct
{
GLuint texture;
GLenum type;
GLfloat texw;
GLfloat texh;
GLenum format;
GLenum formattype;
void *pixels;
int pitch;
SDL_DirtyRectList dirty;
} GLES_TextureData;
static void
GLES_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
GLES_LoadFunctions(GLES_RenderData * data)
{
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#define SDL_PROC(ret,func,params) \
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data->func = func;
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#include "SDL_glesfuncs.h"
#undef SDL_PROC
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return 0;
}
SDL_Renderer *
GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
{
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SDL_Renderer *renderer;
GLES_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 = (GLES_RenderData *) SDL_calloc(1, sizeof(*data));
if (!data) {
GLES_DestroyRenderer(renderer);
SDL_OutOfMemory();
return NULL;
}
renderer->ActivateRenderer = GLES_ActivateRenderer;
renderer->DisplayModeChanged = GLES_DisplayModeChanged;
renderer->CreateTexture = GLES_CreateTexture;
renderer->QueryTexturePixels = GLES_QueryTexturePixels;
renderer->SetTexturePalette = GLES_SetTexturePalette;
renderer->GetTexturePalette = GLES_GetTexturePalette;
renderer->SetTextureColorMod = GLES_SetTextureColorMod;
renderer->SetTextureAlphaMod = GLES_SetTextureAlphaMod;
renderer->SetTextureBlendMode = GLES_SetTextureBlendMode;
renderer->SetTextureScaleMode = GLES_SetTextureScaleMode;
renderer->UpdateTexture = GLES_UpdateTexture;
renderer->LockTexture = GLES_LockTexture;
renderer->UnlockTexture = GLES_UnlockTexture;
renderer->DirtyTexture = GLES_DirtyTexture;
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renderer->RenderDrawPoints = GLES_RenderDrawPoints;
renderer->RenderDrawLines = GLES_RenderDrawLines;
renderer->RenderDrawRects = GLES_RenderDrawRects;
renderer->RenderFillRects = GLES_RenderFillRects;
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renderer->RenderCopy = GLES_RenderCopy;
renderer->RenderPresent = GLES_RenderPresent;
renderer->DestroyTexture = GLES_DestroyTexture;
renderer->DestroyRenderer = GLES_DestroyRenderer;
renderer->info = GL_ES_RenderDriver.info;
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renderer->window = window;
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renderer->driverdata = data;
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renderer->info.flags =
(SDL_RENDERER_PRESENTDISCARD | SDL_RENDERER_ACCELERATED);
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#if defined(__QNXNTO__)
#if _NTO_VERSION<=641
/* QNX's OpenGL ES implementation is broken regarding */
/* packed textures support, affected versions 6.3.2, 6.4.0, 6.4.1 */
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renderer->info.num_texture_formats = 2;
renderer->info.texture_formats[0] = SDL_PIXELFORMAT_ABGR8888;
renderer->info.texture_formats[1] = SDL_PIXELFORMAT_BGR24;
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#endif /* _NTO_VERSION */
#endif /* __QNXNTO__ */
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if (GLES_LoadFunctions(data) < 0) {
GLES_DestroyRenderer(renderer);
return NULL;
}
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data->context = SDL_GL_CreateContext(window);
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if (!data->context) {
GLES_DestroyRenderer(renderer);
return NULL;
}
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if (SDL_GL_MakeCurrent(window, data->context) < 0) {
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GLES_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;
}
}
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#if SDL_VIDEO_DRIVER_PANDORA
data->GL_OES_draw_texture_supported = SDL_FALSE;
data->useDrawTexture = SDL_FALSE;
#else
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if (SDL_GL_ExtensionSupported("GL_OES_draw_texture")) {
data->GL_OES_draw_texture_supported = SDL_TRUE;
data->useDrawTexture = SDL_TRUE;
} else {
data->GL_OES_draw_texture_supported = SDL_FALSE;
data->useDrawTexture = SDL_FALSE;
}
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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->glDisable(GL_DEPTH_TEST);
data->glDisable(GL_CULL_FACE);
data->updateSize = SDL_TRUE;
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data->glEnableClientState(GL_VERTEX_ARRAY);
data->glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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return renderer;
}
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static int
GLES_ActivateRenderer(SDL_Renderer * renderer)
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GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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SDL_Window *window = renderer->window;
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if (SDL_GL_MakeCurrent(window, data->context) < 0) {
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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);
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data->glOrthof(0.0, (GLfloat) window->w, (GLfloat) window->h, 0.0,
0.0, 1.0);
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data->updateSize = SDL_FALSE;
}
return 0;
}
static int
GLES_DisplayModeChanged(SDL_Renderer * renderer)
{
GLES_RenderData *data = (GLES_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
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GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
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{
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *data;
GLint internalFormat;
GLenum format, type;
int texture_w, texture_h;
GLenum result;
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switch (texture->format) {
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case SDL_PIXELFORMAT_RGB24:
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internalFormat = GL_RGB;
format = GL_RGB;
type = GL_UNSIGNED_BYTE;
break;
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case SDL_PIXELFORMAT_BGR888:
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case SDL_PIXELFORMAT_ABGR8888:
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internalFormat = GL_RGBA;
format = GL_RGBA;
type = GL_UNSIGNED_BYTE;
break;
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case SDL_PIXELFORMAT_RGB565:
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internalFormat = GL_RGB;
format = GL_RGB;
type = GL_UNSIGNED_SHORT_5_6_5;
break;
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case SDL_PIXELFORMAT_RGBA5551:
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internalFormat = GL_RGBA;
format = GL_RGBA;
type = GL_UNSIGNED_SHORT_5_5_5_1;
break;
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case SDL_PIXELFORMAT_RGBA4444:
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internalFormat = GL_RGBA;
format = GL_RGBA;
type = GL_UNSIGNED_SHORT_4_4_4_4;
break;
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default:
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SDL_SetError("Texture format %s not supported by OpenGL ES",
SDL_GetPixelFormatName(texture->format));
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return -1;
}
data = (GLES_TextureData *) SDL_calloc(1, sizeof(*data));
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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();
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renderdata->glEnable(GL_TEXTURE_2D);
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renderdata->glGenTextures(1, &data->texture);
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data->type = GL_TEXTURE_2D;
/* no NPOV textures allowed in OpenGL ES (yet) */
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;
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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);
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renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,
texture_h, 0, format, type, NULL);
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renderdata->glDisable(GL_TEXTURE_2D);
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result = renderdata->glGetError();
if (result != GL_NO_ERROR) {
GLES_SetError("glTexImage2D()", result);
return -1;
}
return 0;
}
static int
GLES_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,
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void **pixels, int *pitch)
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{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
*pixels = data->pixels;
*pitch = data->pitch;
return 0;
}
static int
GLES_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Color * colors, int firstcolor, int ncolors)
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SDL_SetError("OpenGL ES does not support paletted textures");
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return -1;
}
static int
GLES_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
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SDL_Color * colors, int firstcolor, int ncolors)
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SDL_SetError("OpenGL ES does not support paletted textures");
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return -1;
}
static void
SetupTextureUpdate(GLES_RenderData * renderdata, SDL_Texture * texture,
int pitch)
{
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GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
renderdata->glBindTexture(data->type, data->texture);
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renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
}
static int
GLES_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
return 0;
}
static int
GLES_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
return 0;
}
static int
GLES_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
switch (texture->blendMode) {
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case SDL_BLENDMODE_NONE:
case SDL_BLENDMODE_MASK:
case SDL_BLENDMODE_BLEND:
case SDL_BLENDMODE_ADD:
case SDL_BLENDMODE_MOD:
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return 0;
default:
SDL_Unsupported();
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texture->blendMode = SDL_BLENDMODE_NONE;
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return -1;
}
}
static int
GLES_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
switch (texture->scaleMode) {
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case SDL_SCALEMODE_NONE:
case SDL_SCALEMODE_FAST:
case SDL_SCALEMODE_SLOW:
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case SDL_SCALEMODE_BEST:
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SDL_Unsupported();
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texture->scaleMode = SDL_SCALEMODE_SLOW;
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return -1;
default:
SDL_Unsupported();
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texture->scaleMode = SDL_SCALEMODE_NONE;
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return -1;
}
}
static int
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GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
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{
GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
GLenum result;
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int bpp = SDL_BYTESPERPIXEL(texture->format);
void * temp_buffer;
void * temp_ptr;
int i;
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renderdata->glGetError();
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renderdata->glEnable(data->type);
SetupTextureUpdate(renderdata, texture, pitch);
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if( rect->w * bpp == pitch ) {
temp_buffer = (void *)pixels; /* No need to reformat */
} else {
/* Reformatting of mem area required */
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;
}
}
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renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,
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rect->h, data->format, data->formattype,
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temp_buffer);
if( temp_buffer != pixels ) {
SDL_free(temp_buffer);
}
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renderdata->glDisable(data->type);
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result = renderdata->glGetError();
if (result != GL_NO_ERROR) {
GLES_SetError("glTexSubImage2D()", result);
return -1;
}
return 0;
}
static int
GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * rect, int markDirty, void **pixels,
int *pitch)
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{
GLES_TextureData *data = (GLES_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
GLES_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
}
static void
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GLES_DirtyTexture(SDL_Renderer * renderer, SDL_Texture * texture,
int numrects, const SDL_Rect * rects)
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{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
int i;
for (i = 0; i < numrects; ++i) {
SDL_AddDirtyRect(&data->dirty, &rects[i]);
}
}
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GLES_SetBlendMode(GLES_RenderData * data, int blendMode, int isprimitive)
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{
if (blendMode != data->blendMode) {
switch (blendMode) {
case SDL_BLENDMODE_NONE:
data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
data->glDisable(GL_BLEND);
break;
case SDL_BLENDMODE_MASK:
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if (isprimitive) {
data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
data->glDisable(GL_BLEND);
/* The same as SDL_BLENDMODE_NONE */
blendMode = SDL_BLENDMODE_NONE;
break;
}
/* fall through */
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case SDL_BLENDMODE_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_BLENDMODE_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_BLENDMODE_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 = blendMode;
}
}
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GLES_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
int count)
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GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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int i;
GLshort *vertices;
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GLES_SetBlendMode(data, renderer->blendMode, 1);
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data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
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vertices = SDL_stack_alloc(GLshort, count*2);
for (i = 0; i < count; ++i) {
vertices[2*i+0] = (GLshort)points[i].x;
vertices[2*i+1] = (GLshort)points[i].y;
}
data->glVertexPointer(2, GL_SHORT, 0, vertices);
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data->glDrawArrays(GL_POINTS, 0, count);
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SDL_stack_free(vertices);
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GLES_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
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GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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int i;
GLshort *vertices;
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GLES_SetBlendMode(data, renderer->blendMode, 1);
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data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
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vertices = SDL_stack_alloc(GLshort, count*2);
for (i = 0; i < count; ++i) {
vertices[2*i+0] = (GLshort)points[i].x;
vertices[2*i+1] = (GLshort)points[i].y;
}
data->glVertexPointer(2, GL_SHORT, 0, vertices);
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if (count > 2 &&
points[0].x == points[count-1].x && points[0].y == points[count-1].y) {
/* GL_LINE_LOOP takes care of the final segment */
--count;
data->glDrawArrays(GL_LINE_LOOP, 0, count);
} else {
data->glDrawArrays(GL_LINE_STRIP, 0, count);
}
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SDL_stack_free(vertices);
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GLES_RenderDrawRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
int count)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
int i;
GLES_SetBlendMode(data, renderer->blendMode, 1);
data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
for (i = 0; i < count; ++i) {
const SDL_Rect *rect = rects[i];
GLshort minx = rect->x;
GLshort maxx = rect->x + rect->w;
GLshort miny = rect->y;
GLshort maxy = rect->y + rect->h;
GLshort vertices[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;
data->glVertexPointer(2, GL_SHORT, 0, vertices);
data->glDrawArrays(GL_LINE_LOOP, 0, 4);
}
return 0;
}
static int
GLES_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
int count)
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{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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GLES_SetBlendMode(data, renderer->blendMode, 1);
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data->glColor4f((GLfloat) renderer->r * inv255f,
(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
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for (i = 0; i < count; ++i) {
const SDL_Rect *rect = rects[i];
GLshort minx = rect->x;
GLshort maxx = rect->x + rect->w;
GLshort miny = rect->y;
GLshort maxy = rect->y + rect->h;
GLshort vertices[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;
data->glVertexPointer(2, GL_SHORT, 0, vertices);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
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return 0;
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}
static int
GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
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const SDL_Rect * srcrect, const SDL_Rect * dstrect)
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GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
int minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
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int i;
void *temp_buffer; /* used for reformatting dirty rect pixels */
void *temp_ptr;
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data->glEnable(GL_TEXTURE_2D);
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if (texturedata->dirty.list) {
SDL_DirtyRect *dirty;
void *pixels;
int bpp = SDL_BYTESPERPIXEL(texture->format);
int pitch = texturedata->pitch;
SetupTextureUpdate(data, texture, pitch);
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data->glBindTexture(texturedata->type, texturedata->texture);
for (dirty = texturedata->dirty.list; dirty; dirty = dirty->next) {
SDL_Rect *rect = &dirty->rect;
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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
*/
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if( rect->x == 0 && rect->w * bpp == pitch ) {
temp_buffer = pixels; /* Updating whole texture, no need to reformat */
} else {
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;
}
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}
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data->glTexSubImage2D(texturedata->type, 0, rect->x, rect->y,
rect->w, rect->h, texturedata->format,
texturedata->formattype, temp_buffer);
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if( temp_buffer != pixels ) {
SDL_free(temp_buffer);
}
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}
SDL_ClearDirtyRects(&texturedata->dirty);
}
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data->glBindTexture(texturedata->type, texturedata->texture);
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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);
}
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GLES_SetBlendMode(data, texture->blendMode, 0);
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switch (texture->scaleMode) {
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case SDL_SCALEMODE_NONE:
case SDL_SCALEMODE_FAST:
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data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,
GL_NEAREST);
data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,
GL_NEAREST);
break;
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case SDL_SCALEMODE_SLOW:
case SDL_SCALEMODE_BEST:
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data->glTexParameteri(texturedata->type, GL_TEXTURE_MIN_FILTER,
GL_LINEAR);
data->glTexParameteri(texturedata->type, GL_TEXTURE_MAG_FILTER,
GL_LINEAR);
break;
}
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 */
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SDL_Window *window = renderer->window;
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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->glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
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data->glDisable(GL_TEXTURE_2D);
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return 0;
}
static void
958
GLES_RenderPresent(SDL_Renderer * renderer)
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{
SDL_GL_SwapWindow(renderer->window);
}
static void
GLES_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
if (!data) {
return;
}
if (data->texture) {
972
glDeleteTextures(1, &data->texture);
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}
if (data->pixels) {
SDL_free(data->pixels);
}
SDL_FreeDirtyRects(&data->dirty);
SDL_free(data);
texture->driverdata = NULL;
}
static void
GLES_DestroyRenderer(SDL_Renderer * renderer)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
if (data) {
if (data->context) {
SDL_GL_DeleteContext(data->context);
}
SDL_free(data);
}
SDL_free(renderer);
}
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#endif /* SDL_VIDEO_RENDER_OGL_ES */
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/* vi: set ts=4 sw=4 expandtab: */