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GRAPHICS: Allow FrameBuffer to manage its own texture

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This commit is contained in:
Dries Harnie 2014-08-29 23:19:59 +02:00
parent 26a37c1410
commit 64c3bbc553
2 changed files with 53 additions and 10 deletions
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55
graphics/opengles2/framebuffer.cpp
View File

@ -33,6 +33,19 @@
namespace Graphics {
template<class T>
static T nextHigher2(T k) {
if (k == 0)
return 1;
--k;
for (uint i = 1; i < sizeof(T) * 8; i <<= 1)
k = k | k >> i;
return k + 1;
}
static bool usePackedBuffer() {
#ifdef USE_GLES2
return Graphics::isExtensionSupported("GL_OES_packed_depth_stencil");
@ -40,26 +53,53 @@ static bool usePackedBuffer() {
return true;
}
FrameBuffer::FrameBuffer(GLuint texture_name, uint width, uint height, uint texture_width, uint texture_height) : _colorTexture(texture_name), _width(width), _height(height) {
FrameBuffer::FrameBuffer(uint width, uint height)
: _managedTexture(true), _width(width), _height(height),
_texWidth(nextHigher2(width)), _texHeight(nextHigher2(height)) {
glGenTextures(1, &_colorTexture);
glBindTexture(GL_TEXTURE_2D, _colorTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, _texWidth, _texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
init();
}
FrameBuffer::FrameBuffer(GLuint texture_name, uint width, uint height, uint texture_width, uint texture_height)
: _managedTexture(false), _colorTexture(texture_name), _width(width), _height(height),
_texWidth(texture_width), _texHeight(texture_height) {
init();
}
FrameBuffer::~FrameBuffer() {
glDeleteRenderbuffers(2, &_renderBuffers[0]);
glDeleteFramebuffers(1, &_frameBuffer);
if (_managedTexture)
glDeleteTextures(1, &_colorTexture);
}
void FrameBuffer::init() {
glGenFramebuffers(1, &_frameBuffer);
glGenRenderbuffers(2, &_renderBuffers[0]);
glBindFramebuffer(GL_FRAMEBUFFER, _frameBuffer);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_name, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, _colorTexture, 0);
if (usePackedBuffer()) {
glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffers[0]);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, texture_width, texture_height);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, _texWidth, _texHeight);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, _renderBuffers[0]);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, _renderBuffers[0]);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
} else {
glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffers[0]);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, texture_width, texture_height);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, _texWidth, _texHeight);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, _renderBuffers[0]);
glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffers[1]);
glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, texture_width, texture_height);
glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, _texWidth, _texHeight);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, _renderBuffers[1]);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
}
@ -73,11 +113,6 @@ FrameBuffer::FrameBuffer(GLuint texture_name, uint width, uint height, uint text
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
FrameBuffer::~FrameBuffer() {
glDeleteRenderbuffers(2, &_renderBuffers[0]);
glDeleteFramebuffers(1, &_frameBuffer);
}
void FrameBuffer::attach() {
glBindFramebuffer(GL_FRAMEBUFFER, _frameBuffer);
glViewport(0,0, _width, _height);

8
graphics/opengles2/framebuffer.h
View File

@ -29,6 +29,7 @@ namespace Graphics {
class FrameBuffer {
public:
FrameBuffer(uint width, uint height);
FrameBuffer(GLuint texture_name, uint width, uint height, uint texture_width, uint texture_height);
~FrameBuffer();
@ -36,12 +37,19 @@ public:
void detach();
GLuint getColorTextureName() const { return _colorTexture; }
uint getWidth() const { return _width; }
uint getHeight() const { return _height; }
uint getTexWidth() const { return _texWidth; }
uint getTexHeight() const { return _texHeight; }
private:
void init();
bool _managedTexture;
GLuint _colorTexture;
GLuint _renderBuffers[2];
GLuint _frameBuffer;
uint _width, _height;
uint _texWidth, _texHeight;
};
}