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POCalling glTexImage2D clears data buffer
 

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  1. POCalling glTexImage2D clears data buffer
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    <p>I'm using LWJGL for its OpenGL bindings and I'm trying to draw a quad with a texture. I have done so successfully, but there is a strange side-effect and I'm unsure why it's presenting itself. </p> <p>The following code executes when first loading the texture (before the first render). I save the value of <code>textureID</code> for when I bind the texture/draw the quad. The following set-up code is taken from an SO answer found <a href="https://stackoverflow.com/questions/10801016/lwjgl-textures-and-strings">here</a>. </p> <pre><code>int textureID = GL11.glGenTextures(); // Generate texture ID GL11.glBindTexture(GL11.GL_TEXTURE_2D, textureID); // Bind texture ID // Setup wrap mode GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_CLAMP); GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL11.GL_CLAMP); // Setup texture scaling filtering GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_NEAREST); GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_NEAREST); // Send texel data to OpenGL GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA8, image.getWidth(), image.getHeight(), 0, GL11.GL_RGBA, GL11.GL_UNSIGNED_BYTE, buffer); </code></pre> <p>In the rendering loop, I draw the quad with the following code:</p> <pre><code>int texture = TextureLoader.loadTexture(TextureLoader.loadImage("/pc_run/run3.png")); GL11.glBindTexture(GL11.GL_TEXTURE_2D, texture); GL11.glBegin(GL11.GL_QUADS); { GL11.glTexCoord2f(0.0f, 0.0f); GL11.glVertex2f(-hw, -hh); GL11.glTexCoord2f(1.0f, 0.0f); GL11.glVertex2f(+hw, -hh); GL11.glTexCoord2f(1.0f, 1.0f); GL11.glVertex2f(+hw, +hh); GL11.glTexCoord2f(0.0f, 1.0f); GL11.glVertex2f(-hw, +hh); } GL11.glEnd(); </code></pre> <p>So far, this works (and is also wrapped between <code>glPushMatrix()</code>/<code>glPopMatrix()</code> calls). However, whatever I have drawn to the GLContext so far is not displayed. Removing the call to <code>GL11.glTexImage2D</code> in the initialization code, the sprite is not displayed, but everything else (non-textured) is displayed correctly.</p>
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    1. USefritz
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    1. COWhy are you loading the texture anew for each frame? This will eat up your memory in no time. textures are not garbage collected. Make the generated texture ID a class member variable and load the texture only once!
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    2. COI'm only creating the texture when I initialize GL.
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    3. COI was just asking, because you have the the call of TextureLoader.loadTexture in the code you described as rendering code.
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