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POWhy is this array selection causing such a glitchy phenomenon?
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2010-07-10T02:26:27.710
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I was loading a image in openGl with the Glaux library when I came across a very strange phenomenon with a array. Some example of what I tried and if they succeeded or not are below. The curFreeId variable is global. The extra variables I created to test with are local to the function. Since when does this effect the flow of code. <pre><code> unsigned int curFreeId = 0; modStruct->t[ i ].gluId = curFreeId; glGenTextures(1, &glTextureList[curFreeId]); glBindTexture(GL_TEXTURE_2D, glTextureList[curFreeId]); </code></pre> vs <pre><code> modStruct->t[ i ].gluId = 0; glGenTextures(1, &glTextureList[0]); glBindTexture(GL_TEXTURE_2D, glTextureList[0]); </code></pre> The first code will not work. The second will. Does anyone have any clue why this happens? EDIT: Strangely enough, this also works correctly. <pre><code>unsigned int curFreeId = 0; modStruct->t[ i ].gluId = curFreeId; glGenTextures(1, &glTextureList[0]); glBindTexture(GL_TEXTURE_2D, glTextureList[curFreeId]); </code></pre> and so does this. <pre><code>unsigned int curFreeId = 0; modStruct->t[ i ].gluId = curFreeId; glGenTextures(1, &glTextureList[curFreeId]); glBindTexture(GL_TEXTURE_2D, glTextureList[0]); </code></pre> Continuing on with some testing. I came across even more curious results. This works <pre><code> unsigned int curFreeId = 0; unsigned int curid = 0; modStruct->t[ i ].gluId = curFreeId; glGenTextures(1, &glTextureList[curid]); glBindTexture(GL_TEXTURE_2D, glTextureList[curFreeId]); </code></pre> But this does not... <pre><code> unsigned int curFreeId = 0; unsigned int curid = curFreeId; modStruct->t[ i ].gluId = curFreeId; glGenTextures(1, &glTextureList[curid]); glBindTexture(GL_TEXTURE_2D, glTextureList[curFreeId]); </code></pre> But this does... <pre><code> unsigned int curFreeId = 0; unsigned int curid = curFreeId = 0; modStruct->t[ i ].gluId = curFreeId; glGenTextures(1, &glTextureList[curid]); glBindTexture(GL_TEXTURE_2D, glTextureList[curFreeId]); </code></pre> What is the world... Is this some glitch of some sort?
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<c++><arrays><opengl>
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Why is this array selection causing such a glitchy phenomenon?
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