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Cleaned up iOS OpenGL ES context creation code and added sRGB context support on iOS 7+

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This commit is contained in:
Alex Szpakowski 2014-07-22 20:06:13 -03:00
parent cf2958a8de
commit 078ca9f078
3 changed files with 79 additions and 53 deletions
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4
src/video/uikit/SDL_uikitopengles.m
View File

@ -132,13 +132,14 @@ UIKit_GL_CreateContext(_THIS, SDL_Window * window)
share_group = [view.context sharegroup];
}
/* construct our view, passing in SDL's OpenGL configuration data */
CGRect frame;
if (window->flags & (SDL_WINDOW_FULLSCREEN|SDL_WINDOW_BORDERLESS)) {
frame = [[uiwindow screen] bounds];
} else {
frame = [[uiwindow screen] applicationFrame];
}
/* construct our view, passing in SDL's OpenGL configuration data */
view = [[SDL_uikitopenglview alloc] initWithFrame: frame
scale: scale
retainBacking: _this->gl_config.retained_backing
@ -148,6 +149,7 @@ UIKit_GL_CreateContext(_THIS, SDL_Window * window)
aBits: _this->gl_config.alpha_size
depthBits: _this->gl_config.depth_size
stencilBits: _this->gl_config.stencil_size
sRGB: _this->gl_config.framebuffer_srgb_capable
majorVersion: _this->gl_config.major_version
shareGroup: share_group];
if (!view) {

1
src/video/uikit/SDL_uikitopenglview.h
View File

@ -71,6 +71,7 @@
aBits:(int)aBits
depthBits:(int)depthBits
stencilBits:(int)stencilBits
sRGB:(BOOL)sRGB
majorVersion:(int)majorVersion
shareGroup:(EAGLSharegroup*)shareGroup;

61
src/video/uikit/SDL_uikitopenglview.m
View File

@ -49,6 +49,7 @@
aBits:(int)aBits
depthBits:(int)depthBits
stencilBits:(int)stencilBits
sRGB:(BOOL)sRGB
majorVersion:(int)majorVersion
shareGroup:(EAGLSharegroup*)shareGroup
{
@ -59,12 +60,29 @@
const BOOL useDepthBuffer = (depthBits != 0);
NSString *colorFormat = nil;
self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.autoresizesSubviews = YES;
/* The EAGLRenderingAPI enum values currently map 1:1 to major GLES
versions, and this allows us to handle future OpenGL ES versions.
*/
EAGLRenderingAPI api = majorVersion;
if (rBits == 8 && gBits == 8 && bBits == 8) {
context = [[EAGLContext alloc] initWithAPI:api sharegroup:shareGroup];
if (!context || ![EAGLContext setCurrentContext:context]) {
[self release];
SDL_SetError("OpenGL ES %d not supported", majorVersion);
return nil;
}
#ifdef __IPHONE_7_0
/* sRGB context support was added in iOS 7 */
BOOL hasiOS7 = [[UIDevice currentDevice].systemVersion compare:@"7.0" options:NSNumericSearch] != NSOrderedAscending;
if (sRGB && hasiOS7) {
colorFormat = kEAGLColorFormatSRGBA8;
} else
#endif
if (rBits >= 8 && gBits >= 8 && bBits >= 8) {
/* if user specifically requests rbg888 or some color format higher than 16bpp */
colorFormat = kEAGLColorFormatRGBA8;
} else {
@ -81,23 +99,24 @@
colorFormat, kEAGLDrawablePropertyColorFormat,
nil];
context = [[EAGLContext alloc] initWithAPI:api sharegroup:shareGroup];
if (!context || ![EAGLContext setCurrentContext:context]) {
[self release];
SDL_SetError("OpenGL ES %d not supported", majorVersion);
return nil;
}
/* Set the appropriate scale (for retina display support) */
self.contentScaleFactor = scale;
/* create the buffers */
glGenFramebuffersOES(1, &viewFramebuffer);
/* Create the color Renderbuffer Object */
glGenRenderbuffersOES(1, &viewRenderbuffer);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
if (![context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:eaglLayer]) {
[self release];
SDL_SetError("Failed creating OpenGL ES drawable");
return nil;
}
/* Create the Framebuffer Object */
glGenFramebuffersOES(1, &viewFramebuffer);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
/* attach the color renderbuffer to the FBO */
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
@ -124,15 +143,14 @@
}
if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES) {
return NO;
[self release];
SDL_SetError("Failed creating OpenGL ES framebuffer");
return nil;
}
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
/* end create buffers */
self.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
self.autoresizesSubviews = YES;
}
return self;
}
@ -220,12 +238,17 @@
- (void)destroyFramebuffer
{
if (viewFramebuffer != 0) {
glDeleteFramebuffersOES(1, &viewFramebuffer);
viewFramebuffer = 0;
}
if (viewRenderbuffer != 0) {
glDeleteRenderbuffersOES(1, &viewRenderbuffer);
viewRenderbuffer = 0;
}
if (depthRenderbuffer) {
if (depthRenderbuffer != 0) {
glDeleteRenderbuffersOES(1, &depthRenderbuffer);
depthRenderbuffer = 0;
}