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POMoving to OpenGL 2.0, getting a black screen
 

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  1. POMoving to OpenGL 2.0, getting a black screen
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    <p>I'm trying to modernize my OpenGL code a little bit by bringing it to OpenGL 2.0 time, but all I get is a black screen... perhaps someone spots a mistake in my code (not that much of code).</p> <p>Here is a snip of the relevant bits of my old, fully working code.</p> <pre><code>// Send color data into GPU memory glEnableClientState(GL_COLOR_ARRAY); GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, colorsHandle); GL15.glBufferData(GL15.GL_ARRAY_BUFFER, colors, GL15.GL_DYNAMIC_DRAW); glColorPointer(4, GL_FLOAT, 0, 0); // Send vertex data into GPU memory glEnableClientState(GL_VERTEX_ARRAY); GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, verticesHandle); GL15.glBufferData(GL15.GL_ARRAY_BUFFER, GL15.GL_DYNAMIC_DRAW); glVertexPointer(3, GL_FLOAT, 0, 0); // Send texcoords data into GPU memory GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, texcoordsHandle); GL15.glBufferData(GL15.GL_ARRAY_BUFFER, GL15.GL_DYNAMIC_DRAW); glTexCoordPointer(2, GL_FLOAT, 0, 0); for (Batch batch : batches) batch.render(); glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_COLOR_ARRAY); glDisableClientState(GL_TEXTURE_COORD_ARRAY); </code></pre> <p>... batch calls glDrawArrays (amongst doing some opengl state changes) ...</p> <pre><code>glDrawArrays(GL_QUADS, spriteOffset * 4, spriteCount * 4); </code></pre> <p>And here is the new code:</p> <pre><code>// Send color data into GPU memory GL20.glEnableVertexAttribArray(0); GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, colorsHandle); GL15.glBufferData(GL15.GL_ARRAY_BUFFER, colors, GL15.GL_DYNAMIC_DRAW); GL20.glVertexAttribPointer(0, 4, GL_FLOAT, false, 0, 0); // Send vertex data into GPU memory GL20.glEnableVertexAttribArray(1); GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, verticesHandle); GL15.glBufferData(GL15.GL_ARRAY_BUFFER, vertices, GL15.GL_DYNAMIC_DRAW); GL20.glVertexAttribPointer(1, 3, GL_FLOAT, false, 0, 0); // Send texcoords data into GPU memory GL20.glEnableVertexAttribArray(2); GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, texcoordsHandle); GL15.glBufferData(GL15.GL_ARRAY_BUFFER, texcoords,GL15.GL_DYNAMIC_DRAW); GL20.glVertexAttribPointer(2, 2, GL_FLOAT, false, 0, 0); for (Batch batch : batches) batch.render(); GL20.glDisableVertexAttribArray(0); GL20.glDisableVertexAttribArray(1); GL20.glDisableVertexAttribArray(2); </code></pre> <p>Like I said the first bit of code works perfectly, but the second does not draw anything at all. Those are the only lines of code I changed in my renderer, and they look correct to me. But obviously there is a problem somewhere... What could possibly cause the absence of rendering?</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USn00bster
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. CO"modernize my OpenGL code a little bit by bringing it to OpenGL 2.0" We're OpenGL 4.2 now, you're still way behind.
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      1. POMoving to OpenGL 2.0, getting a black screen
      1. UScmannett85
 

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