| 24 | } |
| 25 | |
| 26 | bool GraphingTexture::create(int texWidth, int texHeight) |
| 27 | { |
| 28 | m_width = texWidth; |
| 29 | m_height = texHeight; |
| 30 | glActiveTexture(GL_TEXTURE0); |
| 31 | |
| 32 | m_imageData.resize(texWidth * texHeight * 4); |
| 33 | for (int y = 0; y < texHeight; ++y) |
| 34 | { |
| 35 | // const int t=y>>5; |
| 36 | GLubyte* pi = &m_imageData[y * texWidth * 4]; |
| 37 | for (int x = 0; x < texWidth; ++x) |
| 38 | { |
| 39 | if (x >= y) //x<2||y<2||x>253||y>253) |
| 40 | { |
| 41 | pi[0] = 0; |
| 42 | pi[1] = 0; |
| 43 | pi[2] = 255; |
| 44 | pi[3] = 255; |
| 45 | } |
| 46 | else |
| 47 | { |
| 48 | pi[0] = 255; |
| 49 | pi[1] = 0; |
| 50 | pi[2] = 0; |
| 51 | pi[3] = 255; |
| 52 | } |
| 53 | |
| 54 | pi += 4; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | glGenTextures(1, (GLuint*)&m_textureId); |
| 59 | |
| 60 | uploadImageData(); |
| 61 | return true; |
| 62 | } |
| 63 | |
| 64 | void GraphingTexture::uploadImageData() |
| 65 | { |