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SDL_render_gles.c
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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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_config.h"
#if SDL_VIDEO_RENDER_OGL_ES && !SDL_RENDER_DISABLED
#include "SDL_hints.h"
#include "SDL_opengles.h"
#include "../SDL_sysrender.h"
#if defined(SDL_VIDEO_DRIVER_PANDORA)
/* Empty function stub to get OpenGL ES 1.x support without */
/* OpenGL ES extension GL_OES_draw_texture supported */
GL_API void GL_APIENTRY
glDrawTexiOES(GLint x, GLint y, GLint z, GLint width, GLint height)
{
return;
}
#endif /* PANDORA */
/* OpenGL ES 1.1 renderer implementation, based on the OpenGL renderer */
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/* Used to re-create the window with OpenGL ES capability */
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extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);
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static const float inv255f = 1.0f / 255.0f;
static SDL_Renderer *GLES_CreateRenderer(SDL_Window * window, Uint32 flags);
static void GLES_WindowEvent(SDL_Renderer * renderer,
const SDL_WindowEvent *event);
static int GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels,
int pitch);
static int GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch);
static void GLES_UnlockTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
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static int GLES_SetRenderTarget(SDL_Renderer * renderer,
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SDL_Texture * texture);
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static int GLES_UpdateViewport(SDL_Renderer * renderer);
static int GLES_RenderClear(SDL_Renderer * renderer);
static int GLES_RenderDrawPoints(SDL_Renderer * renderer,
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const SDL_FPoint * points, int count);
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static int GLES_RenderDrawLines(SDL_Renderer * renderer,
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const SDL_FPoint * points, int count);
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static int GLES_RenderFillRects(SDL_Renderer * renderer,
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const SDL_FRect * rects, int count);
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static int GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect,
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const SDL_FRect * dstrect);
static int GLES_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip);
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static int GLES_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 pixel_format, void * pixels, int pitch);
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static void GLES_RenderPresent(SDL_Renderer * renderer);
static void GLES_DestroyTexture(SDL_Renderer * renderer,
SDL_Texture * texture);
static void GLES_DestroyRenderer(SDL_Renderer * renderer);
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static int GLES_BindTexture (SDL_Renderer * renderer, SDL_Texture *texture, float *texw, float *texh);
static int GLES_UnbindTexture (SDL_Renderer * renderer, SDL_Texture *texture);
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typedef struct GLES_FBOList GLES_FBOList;
struct GLES_FBOList
{
Uint32 w, h;
GLuint FBO;
GLES_FBOList *next;
};
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SDL_RenderDriver GLES_RenderDriver = {
GLES_CreateRenderer,
{
"opengles",
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(SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE),
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1,
{SDL_PIXELFORMAT_ABGR8888},
0,
0}
};
typedef struct
{
SDL_GLContext context;
struct {
Uint32 color;
int blendMode;
SDL_bool tex_coords;
} current;
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#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
#include "SDL_glesfuncs.h"
#undef SDL_PROC
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SDL_bool GL_OES_framebuffer_object_supported;
GLES_FBOList *framebuffers;
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GLuint window_framebuffer;
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SDL_bool useDrawTexture;
SDL_bool GL_OES_draw_texture_supported;
} GLES_RenderData;
typedef struct
{
GLuint texture;
GLenum type;
GLfloat texw;
GLfloat texh;
GLenum format;
GLenum formattype;
void *pixels;
int pitch;
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GLES_FBOList *fbo;
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} 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);
}
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static int GLES_LoadFunctions(GLES_RenderData * data)
{
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#if SDL_VIDEO_DRIVER_UIKIT
#define __SDL_NOGETPROCADDR__
#elif SDL_VIDEO_DRIVER_ANDROID
#define __SDL_NOGETPROCADDR__
#elif SDL_VIDEO_DRIVER_PANDORA
#define __SDL_NOGETPROCADDR__
#endif
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#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 GLES function %s: %s\n", #func, SDL_GetError()); \
return -1; \
} \
} while ( 0 );
#endif /* _SDL_NOGETPROCADDR_ */
#include "SDL_glesfuncs.h"
#undef SDL_PROC
return 0;
}
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static SDL_GLContext SDL_CurrentContext = NULL;
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GLES_FBOList *
GLES_GetFBO(GLES_RenderData *data, Uint32 w, Uint32 h)
{
GLES_FBOList *result = data->framebuffers;
while ((result) && ((result->w != w) || (result->h != h)) )
{
result = result->next;
}
if (result == NULL)
{
result = SDL_malloc(sizeof(GLES_FBOList));
result->w = w;
result->h = h;
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data->glGenFramebuffersOES(1, &result->FBO);
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result->next = data->framebuffers;
data->framebuffers = result;
}
return result;
}
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static int
GLES_ActivateRenderer(SDL_Renderer * renderer)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
if (SDL_CurrentContext != data->context) {
if (SDL_GL_MakeCurrent(renderer->window, data->context) < 0) {
return -1;
}
SDL_CurrentContext = data->context;
GLES_UpdateViewport(renderer);
}
return 0;
}
/* This is called if we need to invalidate all of the SDL OpenGL state */
static void
GLES_ResetState(SDL_Renderer *renderer)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
if (SDL_CurrentContext == data->context) {
GLES_UpdateViewport(renderer);
} else {
GLES_ActivateRenderer(renderer);
}
data->current.color = 0;
data->current.blendMode = -1;
data->current.tex_coords = SDL_FALSE;
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data->glDisable(GL_DEPTH_TEST);
data->glDisable(GL_CULL_FACE);
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data->glMatrixMode(GL_MODELVIEW);
data->glLoadIdentity();
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data->glEnableClientState(GL_VERTEX_ARRAY);
data->glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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}
SDL_Renderer *
GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
{
SDL_Renderer *renderer;
GLES_RenderData *data;
GLint value;
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Uint32 windowFlags;
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_EGL, 1);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
windowFlags = SDL_GetWindowFlags(window);
if (!(windowFlags & SDL_WINDOW_OPENGL)) {
if (SDL_RecreateWindow(window, windowFlags | SDL_WINDOW_OPENGL) < 0) {
/* Uh oh, better try to put it back... */
SDL_RecreateWindow(window, windowFlags);
return NULL;
}
}
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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->WindowEvent = GLES_WindowEvent;
renderer->CreateTexture = GLES_CreateTexture;
renderer->UpdateTexture = GLES_UpdateTexture;
renderer->LockTexture = GLES_LockTexture;
renderer->UnlockTexture = GLES_UnlockTexture;
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renderer->SetRenderTarget = GLES_SetRenderTarget;
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renderer->UpdateViewport = GLES_UpdateViewport;
renderer->RenderClear = GLES_RenderClear;
renderer->RenderDrawPoints = GLES_RenderDrawPoints;
renderer->RenderDrawLines = GLES_RenderDrawLines;
renderer->RenderFillRects = GLES_RenderFillRects;
renderer->RenderCopy = GLES_RenderCopy;
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renderer->RenderCopyEx = GLES_RenderCopyEx;
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renderer->RenderReadPixels = GLES_RenderReadPixels;
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renderer->RenderPresent = GLES_RenderPresent;
renderer->DestroyTexture = GLES_DestroyTexture;
renderer->DestroyRenderer = GLES_DestroyRenderer;
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renderer->GL_BindTexture = GLES_BindTexture;
renderer->GL_UnbindTexture = GLES_UnbindTexture;
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renderer->info = GLES_RenderDriver.info;
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renderer->info.flags = SDL_RENDERER_ACCELERATED;
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renderer->driverdata = data;
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renderer->window = window;
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data->context = SDL_GL_CreateContext(window);
if (!data->context) {
GLES_DestroyRenderer(renderer);
return NULL;
}
if (SDL_GL_MakeCurrent(window, data->context) < 0) {
GLES_DestroyRenderer(renderer);
return NULL;
}
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if (GLES_LoadFunctions(data) < 0) {
GLES_DestroyRenderer(renderer);
return NULL;
}
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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_VIDEO_DRIVER_PANDORA
data->GL_OES_draw_texture_supported = SDL_FALSE;
data->useDrawTexture = SDL_FALSE;
#else
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;
}
#endif
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value = 0;
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data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
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renderer->info.max_texture_width = value;
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value = 0;
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data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);
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renderer->info.max_texture_height = value;
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if (SDL_GL_ExtensionSupported("GL_OES_framebuffer_object")) {
data->GL_OES_framebuffer_object_supported = SDL_TRUE;
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renderer->info.flags |= SDL_RENDERER_TARGETTEXTURE;
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value = 0;
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data->glGetIntegerv(GL_FRAMEBUFFER_BINDING_OES, &value);
data->window_framebuffer = (GLuint)value;
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}
data->framebuffers = NULL;
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/* Set up parameters for rendering */
GLES_ResetState(renderer);
return renderer;
}
static void
GLES_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
{
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GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED ||
event->event == SDL_WINDOWEVENT_SHOWN ||
event->event == SDL_WINDOWEVENT_HIDDEN) {
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/* Rebind the context to the window area and update matrices */
SDL_CurrentContext = NULL;
}
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if (event->event == SDL_WINDOWEVENT_MINIMIZED) {
/* According to Apple documentation, we need to finish drawing NOW! */
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data->glFinish();
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}
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}
static __inline__ int
power_of_2(int input)
{
int value = 1;
while (value < input) {
value <<= 1;
}
return value;
}
static GLenum
GetScaleQuality(void)
{
const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
return GL_NEAREST;
} else {
return GL_LINEAR;
}
}
static int
GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
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GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;
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GLES_TextureData *data;
GLint internalFormat;
GLenum format, type;
int texture_w, texture_h;
GLenum scaleMode;
GLenum result;
GLES_ActivateRenderer(renderer);
switch (texture->format) {
case SDL_PIXELFORMAT_ABGR8888:
internalFormat = GL_RGBA;
format = GL_RGBA;
type = GL_UNSIGNED_BYTE;
break;
default:
SDL_SetError("Texture format not supported");
return -1;
}
data = (GLES_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_calloc(1, texture->h * data->pitch);
if (!data->pixels) {
SDL_OutOfMemory();
SDL_free(data);
return -1;
}
}
texture->driverdata = data;
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if (texture->access == SDL_TEXTUREACCESS_TARGET) {
data->fbo = GLES_GetFBO(renderer->driverdata, texture->w, texture->h);
} else {
data->fbo = NULL;
}
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renderdata->glGetError();
renderdata->glEnable(GL_TEXTURE_2D);
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;
data->format = format;
data->formattype = type;
scaleMode = GetScaleQuality();
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renderdata->glBindTexture(data->type, data->texture);
renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER, scaleMode);
renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER, scaleMode);
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,
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texture_h, 0, format, type, NULL);
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renderdata->glDisable(GL_TEXTURE_2D);
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result = renderdata->glGetError();
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if (result != GL_NO_ERROR) {
GLES_SetError("glTexImage2D()", result);
return -1;
}
return 0;
}
static int
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;
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GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
Uint8 *blob = NULL;
Uint8 *src;
int srcPitch;
int y;
GLES_ActivateRenderer(renderer);
/* Bail out if we're supposed to update an empty rectangle */
if (rect->w <= 0 || rect->h <= 0)
return 0;
/* Reformat the texture data into a tightly packed array */
srcPitch = rect->w * SDL_BYTESPERPIXEL(texture->format);
src = (Uint8 *)pixels;
if (pitch != srcPitch)
{
blob = (Uint8 *)SDL_malloc(srcPitch * rect->h);
if (!blob)
{
SDL_OutOfMemory();
return -1;
}
src = blob;
for (y = 0; y < rect->h; ++y)
{
SDL_memcpy(src, pixels, srcPitch);
src += srcPitch;
pixels = (Uint8 *)pixels + pitch;
}
src = blob;
}
/* Create a texture subimage with the supplied data */
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renderdata->glGetError();
renderdata->glEnable(data->type);
renderdata->glBindTexture(data->type, data->texture);
renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
renderdata->glTexSubImage2D(data->type,
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0,
rect->x,
rect->y,
rect->w,
rect->h,
data->format,
data->formattype,
src);
if (blob) {
SDL_free(blob);
}
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if (renderdata->glGetError() != GL_NO_ERROR)
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{
SDL_SetError("Failed to update texture");
return -1;
}
return 0;
}
static int
GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch)
{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
*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)
{
GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;
SDL_Rect rect;
/* We do whole texture updates, at least for now */
rect.x = 0;
rect.y = 0;
rect.w = texture->w;
rect.h = texture->h;
GLES_UpdateTexture(renderer, texture, &rect, data->pixels, data->pitch);
}
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static int
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GLES_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture)
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{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *texturedata = NULL;
GLenum status;
GLES_ActivateRenderer(renderer);
if (texture == NULL) {
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data->glBindFramebufferOES(GL_FRAMEBUFFER_OES, data->window_framebuffer);
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return 0;
}
texturedata = (GLES_TextureData *) texture->driverdata;
data->glBindFramebufferOES(GL_FRAMEBUFFER_OES, texturedata->fbo->FBO);
/* TODO: check if texture pixel format allows this operation */
data->glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, texturedata->type, texturedata->texture, 0);
/* Check FBO status */
status = data->glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
if (status != GL_FRAMEBUFFER_COMPLETE_OES) {
SDL_SetError("glFramebufferTexture2DOES() failed");
return -1;
}
return 0;
}
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static int
GLES_UpdateViewport(SDL_Renderer * renderer)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
if (SDL_CurrentContext != data->context) {
/* We'll update the viewport after we rebind the context */
return 0;
}
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data->glViewport(renderer->viewport.x, renderer->viewport.y,
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renderer->viewport.w, renderer->viewport.h);
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data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();
data->glOrthof((GLfloat) 0,
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(GLfloat) renderer->viewport.w,
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(GLfloat) renderer->viewport.h,
(GLfloat) 0, 0.0, 1.0);
return 0;
}
static void
GLES_SetColor(GLES_RenderData * data, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
Uint32 color = ((a << 24) | (r << 16) | (g << 8) | b);
if (color != data->current.color) {
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data->glColor4f((GLfloat) r * inv255f,
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(GLfloat) g * inv255f,
(GLfloat) b * inv255f,
(GLfloat) a * inv255f);
data->current.color = color;
}
}
static void
GLES_SetBlendMode(GLES_RenderData * data, int blendMode)
{
if (blendMode != data->current.blendMode) {
switch (blendMode) {
case SDL_BLENDMODE_NONE:
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data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
data->glDisable(GL_BLEND);
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break;
case SDL_BLENDMODE_BLEND:
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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);
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break;
case SDL_BLENDMODE_ADD:
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data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
data->glEnable(GL_BLEND);
data->glBlendFunc(GL_SRC_ALPHA, GL_ONE);
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break;
case SDL_BLENDMODE_MOD:
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data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
data->glEnable(GL_BLEND);
data->glBlendFunc(GL_ZERO, GL_SRC_COLOR);
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break;
}
data->current.blendMode = blendMode;
}
}
static void
GLES_SetTexCoords(GLES_RenderData * data, SDL_bool enabled)
{
if (enabled != data->current.tex_coords) {
if (enabled) {
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data->glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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} else {
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data->glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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}
data->current.tex_coords = enabled;
}
}
static void
GLES_SetDrawingState(SDL_Renderer * renderer)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_ActivateRenderer(renderer);
GLES_SetColor(data, (GLfloat) renderer->r,
(GLfloat) renderer->g,
(GLfloat) renderer->b,
(GLfloat) renderer->a);
GLES_SetBlendMode(data, renderer->blendMode);
GLES_SetTexCoords(data, SDL_FALSE);
}
static int
GLES_RenderClear(SDL_Renderer * renderer)
{
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GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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GLES_ActivateRenderer(renderer);
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data->glClearColor((GLfloat) renderer->r * inv255f,
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(GLfloat) renderer->g * inv255f,
(GLfloat) renderer->b * inv255f,
(GLfloat) renderer->a * inv255f);
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data->glClear(GL_COLOR_BUFFER_BIT);
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return 0;
}
static int
735
GLES_RenderDrawPoints(SDL_Renderer * renderer, const SDL_FPoint * points,
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int count)
{
738
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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GLES_SetDrawingState(renderer);
742
data->glVertexPointer(2, GL_FLOAT, 0, points);
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data->glDrawArrays(GL_POINTS, 0, count);
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return 0;
}
static int
749
GLES_RenderDrawLines(SDL_Renderer * renderer, const SDL_FPoint * points,
750
751
int count)
{
752
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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GLES_SetDrawingState(renderer);
756
data->glVertexPointer(2, GL_FLOAT, 0, points);
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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;
761
data->glDrawArrays(GL_LINE_LOOP, 0, count);
762
} else {
763
data->glDrawArrays(GL_LINE_STRIP, 0, count);
764
/* We need to close the endpoint of the line */
765
data->glDrawArrays(GL_POINTS, count-1, 1);
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}
return 0;
}
static int
772
GLES_RenderFillRects(SDL_Renderer * renderer, const SDL_FRect * rects,
773
774
int count)
{
775
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
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int i;
GLES_SetDrawingState(renderer);
for (i = 0; i < count; ++i) {
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const SDL_FRect *rect = &rects[i];
GLfloat minx = rect->x;
GLfloat maxx = rect->x + rect->w;
GLfloat miny = rect->y;
GLfloat maxy = rect->y + rect->h;
GLfloat vertices[8];
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vertices[0] = minx;
vertices[1] = miny;
vertices[2] = maxx;
vertices[3] = miny;
vertices[4] = minx;
vertices[5] = maxy;
vertices[6] = maxx;
vertices[7] = maxy;
796
data->glVertexPointer(2, GL_FLOAT, 0, vertices);
797
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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}
return 0;
}
static int
GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
805
const SDL_Rect * srcrect, const SDL_FRect * dstrect)
806
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{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
810
GLfloat minx, miny, maxx, maxy;
811
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GLfloat minu, maxu, minv, maxv;
GLES_ActivateRenderer(renderer);
815
data->glEnable(GL_TEXTURE_2D);
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data->glBindTexture(texturedata->type, texturedata->texture);
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if (texture->modMode) {
GLES_SetColor(data, texture->r, texture->g, texture->b, texture->a);
} else {
GLES_SetColor(data, 255, 255, 255, 255);
}
GLES_SetBlendMode(data, texture->blendMode);
GLES_SetTexCoords(data, SDL_TRUE);
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 */
GLint cropRect[4];
int w, h;
SDL_Window *window = renderer->window;
SDL_GetWindowSize(window, &w, &h);
836
if (renderer->target) {
837
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839
840
841
842
cropRect[0] = srcrect->x;
cropRect[1] = srcrect->y;
cropRect[2] = srcrect->w;
cropRect[3] = srcrect->h;
data->glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES,
cropRect);
843
data->glDrawTexfOES(renderer->viewport.x + dstrect->x, renderer->viewport.y + dstrect->y, 0,
844
845
846
847
848
849
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851
dstrect->w, dstrect->h);
} else {
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);
852
data->glDrawTexfOES(renderer->viewport.x + dstrect->x,
853
854
855
h - (renderer->viewport.y + dstrect->y) - dstrect->h, 0,
dstrect->w, dstrect->h);
}
856
857
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860
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862
863
864
865
866
867
868
869
870
871
} 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;
872
GLfloat vertices[8];
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890
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892
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;
893
data->glVertexPointer(2, GL_FLOAT, 0, vertices);
894
895
data->glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
896
}
897
data->glDisable(GL_TEXTURE_2D);
898
899
900
901
return 0;
}
902
903
static int
GLES_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
904
905
const SDL_Rect * srcrect, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
906
907
908
909
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;
910
GLfloat minx, miny, maxx, maxy;
911
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913
914
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916
917
918
919
920
921
922
923
924
925
926
927
928
929
GLfloat minu, maxu, minv, maxv;
GLfloat centerx, centery;
GLES_ActivateRenderer(renderer);
data->glEnable(GL_TEXTURE_2D);
data->glBindTexture(texturedata->type, texturedata->texture);
if (texture->modMode) {
GLES_SetColor(data, texture->r, texture->g, texture->b, texture->a);
} else {
GLES_SetColor(data, 255, 255, 255, 255);
}
GLES_SetBlendMode(data, texture->blendMode);
GLES_SetTexCoords(data, SDL_TRUE);
930
931
centerx = center->x;
centery = center->y;
932
933
934
// Rotate and translate
data->glPushMatrix();
935
936
data->glTranslatef(dstrect->x + centerx, dstrect->y + centery, 0.0f);
data->glRotatef((GLfloat)angle, 0.0f, 0.0f, 1.0f);
937
938
if (flip & SDL_FLIP_HORIZONTAL) {
939
minx = dstrect->w - centerx;
940
maxx = -centerx;
941
} else {
942
943
944
945
946
947
948
minx = -centerx;
maxx = dstrect->w - centerx;
}
if (flip & SDL_FLIP_VERTICAL) {
miny = dstrect->h - centery;
maxy = -centery;
949
} else {
950
951
952
953
954
955
956
957
958
959
960
961
962
miny = -centery;
maxy = dstrect->h - centery;
}
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;
963
GLfloat vertices[8];
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
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;
983
data->glVertexPointer(2, GL_FLOAT, 0, vertices);
984
985
986
987
988
989
990
991
data->glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
data->glPopMatrix();
data->glDisable(GL_TEXTURE_2D);
return 0;
}
992
993
994
995
996
997
998
999
1000
static int
GLES_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 pixel_format, void * pixels, int pitch)
{
GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;
SDL_Window *window = renderer->window;
Uint32 temp_format = SDL_PIXELFORMAT_ABGR8888;
void *temp_pixels;
int temp_pitch;