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      1 #include "FrameBuffer.h"
      2 
      3 FrameBuffer::FrameBuffer()
      4 {
      5     Reset();
      6 }
      7 
      8 FrameBuffer::~FrameBuffer() {
      9 }
     10 
     11 void FrameBuffer::Reset() {
     12     mFrameBufferName = -1;
     13     mTextureName = -1;
     14     mWidth = 0;
     15     mHeight = 0;
     16     mFormat = -1;
     17 }
     18 
     19 bool FrameBuffer::InitializeGLContext() {
     20     Reset();
     21     return CreateBuffers();
     22 }
     23 
     24 bool FrameBuffer::Init(int width, int height, GLenum format) {
     25     if (mFrameBufferName == (GLuint)-1) {
     26         if (!CreateBuffers()) {
     27             return false;
     28         }
     29     }
     30     glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferName);
     31     glBindTexture(GL_TEXTURE_2D, mTextureName);
     32 
     33     glTexImage2D(GL_TEXTURE_2D,
     34                  0,
     35                  format,
     36                  width,
     37                  height,
     38                  0,
     39                  format,
     40                  GL_UNSIGNED_BYTE,
     41                  NULL);
     42     if (!checkGlError("bind/teximage")) {
     43         return false;
     44     }
     45     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     46     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     47     // This is necessary to work with user-generated frame buffers with
     48     // dimensions that are NOT powers of 2.
     49     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     50     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
     51 
     52     // Attach texture to frame buffer.
     53     glFramebufferTexture2D(GL_FRAMEBUFFER,
     54                            GL_COLOR_ATTACHMENT0,
     55                            GL_TEXTURE_2D,
     56                            mTextureName,
     57                            0);
     58     checkFramebufferStatus("FrameBuffer.cpp");
     59     checkGlError("framebuffertexture2d");
     60 
     61     if (!checkGlError("texture setup")) {
     62         return false;
     63     }
     64     mWidth = width;
     65     mHeight = height;
     66     mFormat = format;
     67     glBindFramebuffer(GL_FRAMEBUFFER, 0);
     68     return true;
     69 }
     70 
     71 bool FrameBuffer::CreateBuffers() {
     72     glGenFramebuffers(1, &mFrameBufferName);
     73     glGenTextures(1, &mTextureName);
     74     if (!checkGlError("texture generation")) {
     75         return false;
     76     }
     77     return true;
     78 }
     79 
     80 GLuint FrameBuffer::GetTextureName() const {
     81     return mTextureName;
     82 }
     83 
     84 GLuint FrameBuffer::GetFrameBufferName() const {
     85     return mFrameBufferName;
     86 }
     87 
     88 GLenum FrameBuffer::GetFormat() const {
     89     return mFormat;
     90 }
     91 
     92 int FrameBuffer::GetWidth() const {
     93     return mWidth;
     94 }
     95 
     96 int FrameBuffer::GetHeight() const {
     97     return mHeight;
     98 }
     99