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SDL_render_gl.c
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2020 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_internal.h"
#if SDL_VIDEO_RENDER_OGL && !SDL_RENDER_DISABLED
#include "SDL_hints.h"
#include "SDL_log.h"
#include "SDL_assert.h"
#include "SDL_opengl.h"
#include "../SDL_sysrender.h"
#include "SDL_shaders_gl.h"
#ifdef __MACOSX__
#include <OpenGL/OpenGL.h>
#endif
/* To prevent unnecessary window recreation,
* these should match the defaults selected in SDL_GL_ResetAttributes
*/
#define RENDERER_CONTEXT_MAJOR 2
#define RENDERER_CONTEXT_MINOR 1
/* OpenGL renderer implementation */
/* Details on optimizing the texture path on Mac OS X:
http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_texturedata/opengl_texturedata.html
*/
/* Used to re-create the window with OpenGL capability */
extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);
static const float inv255f = 1.0f / 255.0f;
typedef struct GL_FBOList GL_FBOList;
struct GL_FBOList
{
Uint32 w, h;
GLuint FBO;
GL_FBOList *next;
};
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typedef struct
{
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SDL_bool viewport_dirty;
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SDL_Rect viewport;
SDL_Texture *texture;
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SDL_Texture *target;
int drawablew;
int drawableh;
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SDL_BlendMode blend;
GL_Shader shader;
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SDL_bool cliprect_enabled_dirty;
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SDL_bool cliprect_enabled;
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SDL_bool cliprect_dirty;
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SDL_Rect cliprect;
SDL_bool texturing;
Uint32 color;
Uint32 clear_color;
} GL_DrawStateCache;
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typedef struct
{
SDL_GLContext context;
SDL_bool debug_enabled;
SDL_bool GL_ARB_debug_output_supported;
int errors;
char **error_messages;
GLDEBUGPROCARB next_error_callback;
GLvoid *next_error_userparam;
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GLenum textype;
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SDL_bool GL_ARB_texture_non_power_of_two_supported;
SDL_bool GL_ARB_texture_rectangle_supported;
SDL_bool GL_EXT_framebuffer_object_supported;
GL_FBOList *framebuffers;
/* OpenGL functions */
#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
#include "SDL_glfuncs.h"
#undef SDL_PROC
/* Multitexture support */
SDL_bool GL_ARB_multitexture_supported;
PFNGLACTIVETEXTUREARBPROC glActiveTextureARB;
GLint num_texture_units;
PFNGLGENFRAMEBUFFERSEXTPROC glGenFramebuffersEXT;
PFNGLDELETEFRAMEBUFFERSEXTPROC glDeleteFramebuffersEXT;
PFNGLFRAMEBUFFERTEXTURE2DEXTPROC glFramebufferTexture2DEXT;
PFNGLBINDFRAMEBUFFEREXTPROC glBindFramebufferEXT;
PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT;
/* Shader support */
GL_ShaderContext *shaders;
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GL_DrawStateCache drawstate;
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} GL_RenderData;
typedef struct
{
GLuint texture;
GLfloat texw;
GLfloat texh;
GLenum format;
GLenum formattype;
void *pixels;
int pitch;
SDL_Rect locked_rect;
/* YUV texture support */
SDL_bool yuv;
SDL_bool nv12;
GLuint utexture;
GLuint vtexture;
GL_FBOList *fbo;
} GL_TextureData;
SDL_FORCE_INLINE const char*
GL_TranslateError (GLenum error)
{
#define GL_ERROR_TRANSLATE(e) case e: return #e;
switch (error) {
GL_ERROR_TRANSLATE(GL_INVALID_ENUM)
GL_ERROR_TRANSLATE(GL_INVALID_VALUE)
GL_ERROR_TRANSLATE(GL_INVALID_OPERATION)
GL_ERROR_TRANSLATE(GL_OUT_OF_MEMORY)
GL_ERROR_TRANSLATE(GL_NO_ERROR)
GL_ERROR_TRANSLATE(GL_STACK_OVERFLOW)
GL_ERROR_TRANSLATE(GL_STACK_UNDERFLOW)
GL_ERROR_TRANSLATE(GL_TABLE_TOO_LARGE)
default:
return "UNKNOWN";
}
#undef GL_ERROR_TRANSLATE
}
SDL_FORCE_INLINE void
GL_ClearErrors(SDL_Renderer *renderer)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
if (!data->debug_enabled)
{
return;
}
if (data->GL_ARB_debug_output_supported) {
if (data->errors) {
int i;
for (i = 0; i < data->errors; ++i) {
SDL_free(data->error_messages[i]);
}
SDL_free(data->error_messages);
data->errors = 0;
data->error_messages = NULL;
}
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} else if (data->glGetError != NULL) {
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while (data->glGetError() != GL_NO_ERROR) {
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/* continue; */
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}
}
}
SDL_FORCE_INLINE int
GL_CheckAllErrors (const char *prefix, SDL_Renderer *renderer, const char *file, int line, const char *function)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
int ret = 0;
if (!data->debug_enabled)
{
return 0;
}
if (data->GL_ARB_debug_output_supported) {
if (data->errors) {
int i;
for (i = 0; i < data->errors; ++i) {
SDL_SetError("%s: %s (%d): %s %s", prefix, file, line, function, data->error_messages[i]);
ret = -1;
}
GL_ClearErrors(renderer);
}
} else {
/* check gl errors (can return multiple errors) */
for (;;) {
GLenum error = data->glGetError();
if (error != GL_NO_ERROR) {
if (prefix == NULL || prefix[0] == '\0') {
prefix = "generic";
}
SDL_SetError("%s: %s (%d): %s %s (0x%X)", prefix, file, line, function, GL_TranslateError(error), error);
ret = -1;
} else {
break;
}
}
}
return ret;
}
#if 0
#define GL_CheckError(prefix, renderer)
#else
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#define GL_CheckError(prefix, renderer) GL_CheckAllErrors(prefix, renderer, SDL_FILE, SDL_LINE, SDL_FUNCTION)
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#endif
static int
GL_LoadFunctions(GL_RenderData * data)
{
#ifdef __SDL_NOGETPROCADDR__
#define SDL_PROC(ret,func,params) data->func=func;
#else
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int retval = 0;
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#define SDL_PROC(ret,func,params) \
do { \
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data->func = SDL_GL_GetProcAddress(#func); \
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if ( ! data->func ) { \
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retval = SDL_SetError("Couldn't load GL function %s: %s", #func, SDL_GetError()); \
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} \
} while ( 0 );
#endif /* __SDL_NOGETPROCADDR__ */
#include "SDL_glfuncs.h"
#undef SDL_PROC
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return retval;
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}
static int
GL_ActivateRenderer(SDL_Renderer * renderer)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
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if (SDL_GL_GetCurrentContext() != data->context) {
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if (SDL_GL_MakeCurrent(renderer->window, data->context) < 0) {
return -1;
}
}
GL_ClearErrors(renderer);
return 0;
}
static void APIENTRY
GL_HandleDebugMessage(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const char *message, const void *userParam)
{
SDL_Renderer *renderer = (SDL_Renderer *) userParam;
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
if (type == GL_DEBUG_TYPE_ERROR_ARB) {
/* Record this error */
int errors = data->errors + 1;
char **error_messages = SDL_realloc(data->error_messages, errors * sizeof(*data->error_messages));
if (error_messages) {
data->errors = errors;
data->error_messages = error_messages;
data->error_messages[data->errors-1] = SDL_strdup(message);
}
}
/* If there's another error callback, pass it along, otherwise log it */
if (data->next_error_callback) {
data->next_error_callback(source, type, id, severity, length, message, data->next_error_userparam);
} else {
if (type == GL_DEBUG_TYPE_ERROR_ARB) {
SDL_LogError(SDL_LOG_CATEGORY_RENDER, "%s", message);
} else {
SDL_LogDebug(SDL_LOG_CATEGORY_RENDER, "%s", message);
}
}
}
static GL_FBOList *
GL_GetFBO(GL_RenderData *data, Uint32 w, Uint32 h)
{
GL_FBOList *result = data->framebuffers;
while (result && ((result->w != w) || (result->h != h))) {
result = result->next;
}
if (!result) {
result = SDL_malloc(sizeof(GL_FBOList));
if (result) {
result->w = w;
result->h = h;
data->glGenFramebuffersEXT(1, &result->FBO);
result->next = data->framebuffers;
data->framebuffers = result;
}
}
return result;
}
static int
GL_GetOutputSize(SDL_Renderer * renderer, int *w, int *h)
{
SDL_GL_GetDrawableSize(renderer->window, w, h);
return 0;
}
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static GLenum GetBlendFunc(SDL_BlendFactor factor)
{
switch (factor) {
case SDL_BLENDFACTOR_ZERO:
return GL_ZERO;
case SDL_BLENDFACTOR_ONE:
return GL_ONE;
case SDL_BLENDFACTOR_SRC_COLOR:
return GL_SRC_COLOR;
case SDL_BLENDFACTOR_ONE_MINUS_SRC_COLOR:
return GL_ONE_MINUS_SRC_COLOR;
case SDL_BLENDFACTOR_SRC_ALPHA:
return GL_SRC_ALPHA;
case SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA:
return GL_ONE_MINUS_SRC_ALPHA;
case SDL_BLENDFACTOR_DST_COLOR:
return GL_DST_COLOR;
case SDL_BLENDFACTOR_ONE_MINUS_DST_COLOR:
return GL_ONE_MINUS_DST_COLOR;
case SDL_BLENDFACTOR_DST_ALPHA:
return GL_DST_ALPHA;
case SDL_BLENDFACTOR_ONE_MINUS_DST_ALPHA:
return GL_ONE_MINUS_DST_ALPHA;
default:
return GL_INVALID_ENUM;
}
}
static GLenum GetBlendEquation(SDL_BlendOperation operation)
{
switch (operation) {
case SDL_BLENDOPERATION_ADD:
return GL_FUNC_ADD;
case SDL_BLENDOPERATION_SUBTRACT:
return GL_FUNC_SUBTRACT;
case SDL_BLENDOPERATION_REV_SUBTRACT:
return GL_FUNC_REVERSE_SUBTRACT;
default:
return GL_INVALID_ENUM;
}
}
static SDL_bool
GL_SupportsBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
{
SDL_BlendFactor srcColorFactor = SDL_GetBlendModeSrcColorFactor(blendMode);
SDL_BlendFactor srcAlphaFactor = SDL_GetBlendModeSrcAlphaFactor(blendMode);
SDL_BlendOperation colorOperation = SDL_GetBlendModeColorOperation(blendMode);
SDL_BlendFactor dstColorFactor = SDL_GetBlendModeDstColorFactor(blendMode);
SDL_BlendFactor dstAlphaFactor = SDL_GetBlendModeDstAlphaFactor(blendMode);
SDL_BlendOperation alphaOperation = SDL_GetBlendModeAlphaOperation(blendMode);
if (GetBlendFunc(srcColorFactor) == GL_INVALID_ENUM ||
GetBlendFunc(srcAlphaFactor) == GL_INVALID_ENUM ||
GetBlendEquation(colorOperation) == GL_INVALID_ENUM ||
GetBlendFunc(dstColorFactor) == GL_INVALID_ENUM ||
GetBlendFunc(dstAlphaFactor) == GL_INVALID_ENUM ||
GetBlendEquation(alphaOperation) == GL_INVALID_ENUM) {
return SDL_FALSE;
}
if (colorOperation != alphaOperation) {
return SDL_FALSE;
}
return SDL_TRUE;
}
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SDL_FORCE_INLINE int
power_of_2(int input)
{
int value = 1;
while (value < input) {
value <<= 1;
}
return value;
}
SDL_FORCE_INLINE SDL_bool
convert_format(GL_RenderData *renderdata, Uint32 pixel_format,
GLint* internalFormat, GLenum* format, GLenum* type)
{
switch (pixel_format) {
case SDL_PIXELFORMAT_ARGB8888:
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case SDL_PIXELFORMAT_RGB888:
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*internalFormat = GL_RGBA8;
*format = GL_BGRA;
*type = GL_UNSIGNED_INT_8_8_8_8_REV;
break;
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case SDL_PIXELFORMAT_ABGR8888:
case SDL_PIXELFORMAT_BGR888:
*internalFormat = GL_RGBA8;
*format = GL_RGBA;
*type = GL_UNSIGNED_INT_8_8_8_8_REV;
break;
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case SDL_PIXELFORMAT_YV12:
case SDL_PIXELFORMAT_IYUV:
case SDL_PIXELFORMAT_NV12:
case SDL_PIXELFORMAT_NV21:
*internalFormat = GL_LUMINANCE;
*format = GL_LUMINANCE;
*type = GL_UNSIGNED_BYTE;
break;
#ifdef __MACOSX__
case SDL_PIXELFORMAT_UYVY:
*internalFormat = GL_RGB8;
*format = GL_YCBCR_422_APPLE;
*type = GL_UNSIGNED_SHORT_8_8_APPLE;
break;
#endif
default:
return SDL_FALSE;
}
return SDL_TRUE;
}
static int
GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
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const GLenum textype = renderdata->textype;
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GL_TextureData *data;
GLint internalFormat;
GLenum format, type;
int texture_w, texture_h;
GLenum scaleMode;
GL_ActivateRenderer(renderer);
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renderdata->drawstate.texture = NULL; /* we trash this state. */
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if (texture->access == SDL_TEXTUREACCESS_TARGET &&
!renderdata->GL_EXT_framebuffer_object_supported) {
return SDL_SetError("Render targets not supported by OpenGL");
}
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if (!convert_format(renderdata, texture->format, &internalFormat,
&format, &type)) {
return SDL_SetError("Texture format %s not supported by OpenGL",
SDL_GetPixelFormatName(texture->format));
}
data = (GL_TextureData *) SDL_calloc(1, sizeof(*data));
if (!data) {
return SDL_OutOfMemory();
}
if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
size_t size;
data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);
size = texture->h * data->pitch;
if (texture->format == SDL_PIXELFORMAT_YV12 ||
texture->format == SDL_PIXELFORMAT_IYUV) {
/* Need to add size for the U and V planes */
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size += 2 * ((texture->h + 1) / 2) * ((data->pitch + 1) / 2);
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}
if (texture->format == SDL_PIXELFORMAT_NV12 ||
texture->format == SDL_PIXELFORMAT_NV21) {
/* Need to add size for the U/V plane */
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size += 2 * ((texture->h + 1) / 2) * ((data->pitch + 1) / 2);
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}
data->pixels = SDL_calloc(1, size);
if (!data->pixels) {
SDL_free(data);
return SDL_OutOfMemory();
}
}
if (texture->access == SDL_TEXTUREACCESS_TARGET) {
data->fbo = GL_GetFBO(renderdata, texture->w, texture->h);
} else {
data->fbo = NULL;
}
GL_CheckError("", renderer);
renderdata->glGenTextures(1, &data->texture);
if (GL_CheckError("glGenTextures()", renderer) < 0) {
if (data->pixels) {
SDL_free(data->pixels);
}
SDL_free(data);
return -1;
}
texture->driverdata = data;
if (renderdata->GL_ARB_texture_non_power_of_two_supported) {
texture_w = texture->w;
texture_h = texture->h;
data->texw = 1.0f;
data->texh = 1.0f;
} else if (renderdata->GL_ARB_texture_rectangle_supported) {
texture_w = texture->w;
texture_h = texture->h;
data->texw = (GLfloat) texture_w;
data->texh = (GLfloat) texture_h;
} else {
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;
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scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;
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renderdata->glEnable(textype);
renderdata->glBindTexture(textype, data->texture);
renderdata->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER, scaleMode);
renderdata->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER, scaleMode);
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/* According to the spec, CLAMP_TO_EDGE is the default for TEXTURE_RECTANGLE
and setting it causes an INVALID_ENUM error in the latest NVidia drivers.
*/
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if (textype != GL_TEXTURE_RECTANGLE_ARB) {
renderdata->glTexParameteri(textype, GL_TEXTURE_WRAP_S,
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GL_CLAMP_TO_EDGE);
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renderdata->glTexParameteri(textype, GL_TEXTURE_WRAP_T,
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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) {
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renderdata->glTexParameteri(textype, GL_TEXTURE_STORAGE_HINT_APPLE,
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GL_STORAGE_SHARED_APPLE);
} else {
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renderdata->glTexParameteri(textype, GL_TEXTURE_STORAGE_HINT_APPLE,
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GL_STORAGE_CACHED_APPLE);
}
if (texture->access == SDL_TEXTUREACCESS_STREAMING
&& texture->format == SDL_PIXELFORMAT_ARGB8888
&& (texture->w % 8) == 0) {
renderdata->glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);
renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH,
(data->pitch / SDL_BYTESPERPIXEL(texture->format)));
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renderdata->glTexImage2D(textype, 0, internalFormat, texture_w,
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texture_h, 0, format, type, data->pixels);
renderdata->glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_FALSE);
}
else
#endif
{
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renderdata->glTexImage2D(textype, 0, internalFormat, texture_w,
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texture_h, 0, format, type, NULL);
}
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renderdata->glDisable(textype);
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if (GL_CheckError("glTexImage2D()", renderer) < 0) {
return -1;
}
if (texture->format == SDL_PIXELFORMAT_YV12 ||
texture->format == SDL_PIXELFORMAT_IYUV) {
data->yuv = SDL_TRUE;
renderdata->glGenTextures(1, &data->utexture);
renderdata->glGenTextures(1, &data->vtexture);
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renderdata->glEnable(textype);
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renderdata->glBindTexture(textype, data->utexture);
renderdata->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER,
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scaleMode);
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renderdata->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER,
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scaleMode);
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renderdata->glTexParameteri(textype, GL_TEXTURE_WRAP_S,
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GL_CLAMP_TO_EDGE);
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renderdata->glTexParameteri(textype, GL_TEXTURE_WRAP_T,
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GL_CLAMP_TO_EDGE);
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renderdata->glTexImage2D(textype, 0, internalFormat, (texture_w+1)/2,
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(texture_h+1)/2, 0, format, type, NULL);
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renderdata->glBindTexture(textype, data->vtexture);
renderdata->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER,
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scaleMode);
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renderdata->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER,
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scaleMode);
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renderdata->glTexParameteri(textype, GL_TEXTURE_WRAP_S,
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GL_CLAMP_TO_EDGE);
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renderdata->glTexParameteri(textype, GL_TEXTURE_WRAP_T,
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GL_CLAMP_TO_EDGE);
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renderdata->glTexImage2D(textype, 0, internalFormat, (texture_w+1)/2,
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(texture_h+1)/2, 0, format, type, NULL);
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renderdata->glDisable(textype);
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}
if (texture->format == SDL_PIXELFORMAT_NV12 ||
texture->format == SDL_PIXELFORMAT_NV21) {
data->nv12 = SDL_TRUE;
renderdata->glGenTextures(1, &data->utexture);
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renderdata->glEnable(textype);
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renderdata->glBindTexture(textype, data->utexture);
renderdata->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER,
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scaleMode);
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renderdata->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER,
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scaleMode);
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renderdata->glTexParameteri(textype, GL_TEXTURE_WRAP_S,
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GL_CLAMP_TO_EDGE);
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renderdata->glTexParameteri(textype, GL_TEXTURE_WRAP_T,
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GL_CLAMP_TO_EDGE);
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renderdata->glTexImage2D(textype, 0, GL_LUMINANCE_ALPHA, (texture_w+1)/2,
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(texture_h+1)/2, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, NULL);
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renderdata->glDisable(textype);
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}
return GL_CheckError("", renderer);
}
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;
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const GLenum textype = renderdata->textype;
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GL_TextureData *data = (GL_TextureData *) texture->driverdata;
const int texturebpp = SDL_BYTESPERPIXEL(texture->format);
SDL_assert(texturebpp != 0); /* otherwise, division by zero later. */
GL_ActivateRenderer(renderer);
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renderdata->drawstate.texture = NULL; /* we trash this state. */
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renderdata->glEnable(textype);
renderdata->glBindTexture(textype, data->texture);
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renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, (pitch / texturebpp));
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renderdata->glTexSubImage2D(textype, 0, rect->x, rect->y, rect->w,
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rect->h, data->format, data->formattype,
pixels);
if (data->yuv) {
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renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, ((pitch + 1) / 2));
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/* Skip to the correct offset into the next texture */
pixels = (const void*)((const Uint8*)pixels + rect->h * pitch);
if (texture->format == SDL_PIXELFORMAT_YV12) {
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renderdata->glBindTexture(textype, data->vtexture);
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} else {
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renderdata->glBindTexture(textype, data->utexture);
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}
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renderdata->glTexSubImage2D(textype, 0, rect->x/2, rect->y/2,
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(rect->w+1)/2, (rect->h+1)/2,
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data->format, data->formattype, pixels);
/* Skip to the correct offset into the next texture */
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pixels = (const void*)((const Uint8*)pixels + ((rect->h + 1) / 2) * ((pitch + 1) / 2));
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if (texture->format == SDL_PIXELFORMAT_YV12) {
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renderdata->glBindTexture(textype, data->utexture);
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} else {
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renderdata->glBindTexture(textype, data->vtexture);
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}
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renderdata->glTexSubImage2D(textype, 0, rect->x/2, rect->y/2,
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(rect->w+1)/2, (rect->h+1)/2,
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data->format, data->formattype, pixels);
}
if (data->nv12) {
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renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, ((pitch + 1) / 2));
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/* Skip to the correct offset into the next texture */
pixels = (const void*)((const Uint8*)pixels + rect->h * pitch);
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renderdata->glBindTexture(textype, data->utexture);
renderdata->glTexSubImage2D(textype, 0, rect->x/2, rect->y/2,
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(rect->w + 1)/2, (rect->h + 1)/2,
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GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, pixels);
}
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renderdata->glDisable(textype);
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return GL_CheckError("glTexSubImage2D()", renderer);
}
static int
GL_UpdateTextureYUV(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect,
const Uint8 *Yplane, int Ypitch,
const Uint8 *Uplane, int Upitch,
const Uint8 *Vplane, int Vpitch)
{
GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
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const GLenum textype = renderdata->textype;
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GL_TextureData *data = (GL_TextureData *) texture->driverdata;
GL_ActivateRenderer(renderer);
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renderdata->drawstate.texture = NULL; /* we trash this state. */
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renderdata->glEnable(textype);
renderdata->glBindTexture(textype, data->texture);
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renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, Ypitch);
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renderdata->glTexSubImage2D(textype, 0, rect->x, rect->y, rect->w,
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rect->h, data->format, data->formattype,
Yplane);
renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, Upitch);
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renderdata->glBindTexture(textype, data->utexture);
renderdata->glTexSubImage2D(textype, 0, rect->x/2, rect->y/2,
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(rect->w + 1)/2, (rect->h + 1)/2,
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data->format, data->formattype, Uplane);
renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, Vpitch);
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renderdata->glBindTexture(textype, data->vtexture);
renderdata->glTexSubImage2D(textype, 0, rect->x/2, rect->y/2,
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(rect->w + 1)/2, (rect->h + 1)/2,
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data->format, data->formattype, Vplane);
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renderdata->glDisable(textype);
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return GL_CheckError("glTexSubImage2D()", renderer);
}
static int
GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch)
{
GL_TextureData *data = (GL_TextureData *) texture->driverdata;
data->locked_rect = *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)
{
GL_TextureData *data = (GL_TextureData *) texture->driverdata;
const SDL_Rect *rect;
void *pixels;
rect = &data->locked_rect;
pixels =
(void *) ((Uint8 *) data->pixels + rect->y * data->pitch +
rect->x * SDL_BYTESPERPIXEL(texture->format));
GL_UpdateTexture(renderer, texture, rect, pixels, data->pitch);
}
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static void
GL_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture, SDL_ScaleMode scaleMode)
{
GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
const GLenum textype = renderdata->textype;
GL_TextureData *data = (GL_TextureData *) texture->driverdata;
GLenum glScaleMode = (scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;
renderdata->glEnable(textype);
renderdata->glBindTexture(textype, data->texture);
renderdata->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER, glScaleMode);
renderdata->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER, glScaleMode);
renderdata->glDisable(textype);
if (texture->format == SDL_PIXELFORMAT_YV12 ||
texture->format == SDL_PIXELFORMAT_IYUV) {
renderdata->glEnable(textype);
renderdata->glBindTexture(textype, data->utexture);
renderdata->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER, glScaleMode);
renderdata->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER, glScaleMode);
renderdata->glBindTexture(textype, data->vtexture);
renderdata->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER, glScaleMode);
renderdata->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER, glScaleMode);
renderdata->glDisable(textype);
}
if (texture->format == SDL_PIXELFORMAT_NV12 ||
texture->format == SDL_PIXELFORMAT_NV21) {
renderdata->glEnable(textype);
renderdata->glBindTexture(textype, data->utexture);
renderdata->glTexParameteri(textype, GL_TEXTURE_MIN_FILTER, glScaleMode);
renderdata->glTexParameteri(textype, GL_TEXTURE_MAG_FILTER, glScaleMode);
renderdata->glDisable(textype);
}
}
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static int
GL_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
GL_TextureData *texturedata;
GLenum status;
GL_ActivateRenderer(renderer);
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if (!data->GL_EXT_framebuffer_object_supported) {
return SDL_SetError("Render targets not supported by OpenGL");
}
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data->drawstate.viewport_dirty = SDL_TRUE;
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if (texture == NULL) {
data->glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
return 0;
}
texturedata = (GL_TextureData *) texture->driverdata;
data->glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, texturedata->fbo->FBO);
/* TODO: check if texture pixel format allows this operation */
831
data->glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, data->textype, texturedata->texture, 0);
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/* Check FBO status */
status = data->glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
return SDL_SetError("glFramebufferTexture2DEXT() failed");
}
return 0;
}
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/* !!! FIXME: all these Queue* calls set up the vertex buffer the way the immediate mode
!!! FIXME: renderer wants it, but this might want to operate differently if we move to
!!! FIXME: VBOs at some point. */
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static int
GL_QueueSetViewport(SDL_Renderer * renderer, SDL_RenderCommand *cmd)
{
return 0; /* nothing to do in this backend. */
}
849
static int
850
GL_QueueDrawPoints(SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FPoint * points, int count)
851
{
852
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, count * 2 * sizeof (GLfloat), 0, &cmd->data.draw.first);
853
int i;
854
855
856
if (!verts) {
return -1;
857
858
}
859
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862
cmd->data.draw.count = count;
for (i = 0; i < count; i++) {
*(verts++) = 0.5f + points[i].x;
*(verts++) = 0.5f + points[i].y;
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865
866
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868
}
return 0;
}
static int
869
GL_QueueFillRects(SDL_Renderer * renderer, SDL_RenderCommand *cmd, const SDL_FRect * rects, int count)
870
{
871
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, count * 4 * sizeof (GLfloat), 0, &cmd->data.draw.first);
872
int i;
873
874
875
if (!verts) {
return -1;
876
877
}
878
879
cmd->data.draw.count = count;
for (i = 0; i < count; i++) {
880
const SDL_FRect *rect = &rects[i];
881
882
883
884
*(verts++) = rect->x;
*(verts++) = rect->y;
*(verts++) = rect->x + rect->w;
*(verts++) = rect->y + rect->h;
885
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888
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890
}
return 0;
}
static int
891
892
GL_QueueCopy(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect)
893
894
895
896
{
GL_TextureData *texturedata = (GL_TextureData *) texture->driverdata;
GLfloat minx, miny, maxx, maxy;
GLfloat minu, maxu, minv, maxv;
897
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, 8 * sizeof (GLfloat), 0, &cmd->data.draw.first);
898
899
if (!verts) {
900
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902
return -1;
}
903
904
cmd->data.draw.count = 1;
905
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907
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913
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916
917
918
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;
919
920
921
922
923
924
925
926
927
928
cmd->data.draw.count = 1;
*(verts++) = minx;
*(verts++) = miny;
*(verts++) = maxx;
*(verts++) = maxy;
*(verts++) = minu;
*(verts++) = maxu;
*(verts++) = minv;
*(verts++) = maxv;
return 0;
929
930
931
}
static int
932
933
934
GL_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
935
936
937
938
939
{
GL_TextureData *texturedata = (GL_TextureData *) texture->driverdata;
GLfloat minx, miny, maxx, maxy;
GLfloat centerx, centery;
GLfloat minu, maxu, minv, maxv;
940
GLfloat *verts = (GLfloat *) SDL_AllocateRenderVertices(renderer, 11 * sizeof (GLfloat), 0, &cmd->data.draw.first);
941
942
if (!verts) {
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
return -1;
}
centerx = center->x;
centery = center->y;
if (flip & SDL_FLIP_HORIZONTAL) {
minx = dstrect->w - centerx;
maxx = -centerx;
}
else {
minx = -centerx;
maxx = dstrect->w - centerx;
}
if (flip & SDL_FLIP_VERTICAL) {
miny = dstrect->h - centery;
maxy = -centery;
}
else {
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;
976
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978
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980
981
982
983
984
985
986
987
988
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990
991
cmd->data.draw.count = 1;
*(verts++) = minx;
*(verts++) = miny;
*(verts++) = maxx;
*(verts++) = maxy;
*(verts++) = minu;
*(verts++) = maxu;
*(verts++) = minv;
*(verts++) = maxv;
*(verts++) = (GLfloat) dstrect->x + centerx;
*(verts++) = (GLfloat) dstrect->y + centery;
*(verts++) = (GLfloat) angle;
return 0;
}
static void
992
SetDrawState(GL_RenderData *data, const SDL_RenderCommand *cmd, const GL_Shader shader)
993
994
995
{
const SDL_BlendMode blend = cmd->data.draw.blend;
996
997
998
999
1000
if (data->drawstate.viewport_dirty) {
const SDL_bool istarget = data->drawstate.target != NULL;
const SDL_Rect *viewport = &data->drawstate.viewport;
data->glMatrixMode(GL_PROJECTION);
data->glLoadIdentity();