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PODDS texture transparency rendered black Opengl
 

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  1. PODDS texture transparency rendered black Opengl
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    <p>I am currently trying to render textured objects in Opengl. Everything worked fine until I wanted to render a texture with transparency. Instead of showing the the object transparent it just rendered in total black.</p> <p>The method fo loading the texture file is this:</p> <pre><code>// structures for reading and information variables char magic[4]; unsigned char header[124]; unsigned int width, height, linearSize, mipMapCount, fourCC; unsigned char* dataBuffer; unsigned int bufferSize; fstream file(path, ios::in|ios::binary); // read magic and header if (!file.read((char*)magic, sizeof(magic))){ cerr&lt;&lt; "File " &lt;&lt; path &lt;&lt; " not found!"&lt;&lt;endl; return false; } if (magic[0]!='D' || magic[1]!='D' || magic[2]!='S' || magic[3]!=' '){ cerr&lt;&lt; "File does not comply with dds file format!"&lt;&lt;endl; return false; } if (!file.read((char*)header, sizeof(header))){ cerr&lt;&lt; "Not able to read file information!"&lt;&lt;endl; return false; } // derive information from header height = *(int*)&amp;(header[8]); width = *(int*)&amp;(header[12]); linearSize = *(int*)&amp;(header[16]); mipMapCount = *(int*)&amp;(header[24]); fourCC = *(int*)&amp;(header[80]); // determine dataBuffer size bufferSize = mipMapCount &gt; 1 ? linearSize * 2 : linearSize; dataBuffer = new unsigned char [bufferSize*2]; // read data and close file if (file.read((char*)dataBuffer, bufferSize/1.5)) cout&lt;&lt;"Loading texture "&lt;&lt;path&lt;&lt;" successful"&lt;&lt;endl; else{ cerr&lt;&lt;"Data of file "&lt;&lt;path&lt;&lt;" corrupted"&lt;&lt;endl; return false; } file.close(); // check pixel format unsigned int format; switch(fourCC){ case FOURCC_DXT1: format = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT; break; case FOURCC_DXT3: format = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT; break; case FOURCC_DXT5: format = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT; break; default: cerr &lt;&lt; "Compression type not supported or corrupted!" &lt;&lt; endl; return false; } glGenTextures(1, &amp;ID); glBindTexture(GL_TEXTURE_2D, ID); glPixelStorei(GL_UNPACK_ALIGNMENT,1); unsigned int blockSize = (format == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) ? 8 : 16; unsigned int offset = 0; /* load the mipmaps */ for (unsigned int level = 0; level &lt; mipMapCount &amp;&amp; (width || height); ++level) { unsigned int size = ((width+3)/4)*((height+3)/4)*blockSize; glCompressedTexImage2D(GL_TEXTURE_2D, level, format, width, height, 0, size, dataBuffer + offset); offset += size; width /= 2; height /= 2; } textureType = DDS_TEXTURE; return true; </code></pre> <p>In the fragment shader I just set the gl_FragColor = texture2D( myTextureSampler, UVcoords )</p> <p>I hope that there is an easy explanation such as some code missing. In the openGL initialization i glEnabled GL_Blend and set a blend function.</p> <p>Does anyone have an idea of what I did wrong?</p>
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