Graphics Reference
In-Depth Information
/Applications/Imagination/PowerVR/GraphicsSDK/PVRTexTool/CL/OSX_x86/PVRTexToolCL -i
{input_file_name}.png -o {output_file_name}.pvr -legacypvr -p -f PVRTC1_4 -q
pvrtcbest
Listing 14.8 shows the code required to load and display a PVRTC image (adapted from the
CAEAGLLayer
example code in Chapter 6).
Listing 14.8
Loading and Displaying a PVRTC Image
#import
"ViewController.h"
#import
<QuartzCore/QuartzCore.h>
#import
<GLKit/GLKit.h>
@interface
ViewController
()
@property
(
nonatomic
,
weak
)
IBOutlet
UIView
*glView;
@property
(
nonatomic
,
strong
)
EAGLContext
*glContext;
@property
(
nonatomic
,
strong
)
CAEAGLLayer
*glLayer;
@property
(
nonatomic
,
assign
)
GLuint
framebuffer;
@property
(
nonatomic
,
assign
)
GLuint
colorRenderbuffer;
@property
(
nonatomic
,
assign
)
GLint
framebufferWidth;
@property
(
nonatomic
,
assign
)
GLint
framebufferHeight;
@property
(
nonatomic
,
strong
)
GLKBaseEffect
*effect;
@property
(
nonatomic
,
strong
)
GLKTextureInfo
*textureInfo;
@end
@implementation
ViewController
- (
void
)setUpBuffers
{
//set up frame buffer
glGenFramebuffers
(
1
, &
_framebuffer
);
glBindFramebuffer
(
GL_FRAMEBUFFER
,
_framebuffer
);
//set up color render buffer
glGenRenderbuffers
(
1
, &
_colorRenderbuffer
);
glBindRenderbuffer
(
GL_RENDERBUFFER
,
_colorRenderbuffer
);
glFramebufferRenderbuffer
(
GL_FRAMEBUFFER
,
GL_COLOR_ATTACHMENT0
,
GL_RENDERBUFFER
,
_colorRenderbuffer
);
[
self
.
glContext
renderbufferStorage
:
GL_RENDERBUFFER
fromDrawable
:
self
.
glLayer
];
glGetRenderbufferParameteriv
(
GL_RENDERBUFFER
,
GL_RENDERBUFFER_WIDTH
, &
_framebufferWidth
);
glGetRenderbufferParameteriv
(
GL_RENDERBUFFER
,
GL_RENDERBUFFER_HEIGHT
, &
_framebufferHeight
);
