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POMatch texture coordinates to primitive size
 

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  1. POMatch texture coordinates to primitive size
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    <p>I'm working on font generation solution and facing texture problem. I'm creating texture atlas dynamically and then mapping every letter by their texture coordinates. </p> <p>Here's result of mapping "t" letter: (generated texture is on top and what I draw is on bottom)</p> <p><img src="https://i.stack.imgur.com/a1Yj3.png" alt="Problem"> It seem that the issue is that size of the primitive and texture region is not matching that's why openGL trying to resize it. I'm using GL_NEAREST on both Min and Mag when loading / rendering texture</p> <p>Here's the render code:</p> <pre><code>glBegin(GL_TRIANGLE_STRIP); float twidth = 7.f / 512.f; float theight = 11.f / 512.f; float width = 7.f; float height = 11.f; float w = width / 2.f; float h = height / 2.f; float x = 100; float y = 100; float tx = 135.f / 512.f; float ty = 0; glTexCoord2f(tx, ty); glVertex2f(x - w, y-h); glTexCoord2f(tx + twidth, ty); glVertex2f(x + w, y-h); glTexCoord2f(tx, ty + theight); glVertex2f(x - w, y+h); glTexCoord2f(tx + twidth, ty + theight); glVertex2f(x + w, y+h); glEnd(); </code></pre> <p>Here's initialization code:</p> <pre><code>glViewport(0,0,width,height); glDisable(GL_LIGHTING); glDisable(GL_DEPTH_TEST); // Set up the GL state. glClearColor(1, 1, 1, 1); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnableClientState(GL_COLOR_ARRAY); //glDisable(GL_BLEND); glEnable(GL_BLEND); glEnable(GL_TEXTURE_2D); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0, width, height, 0, -1, 1); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); </code></pre> <p>Texture loading code:</p> <pre><code> glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 512, 512, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, &amp;texBinary[0]); </code></pre>
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    1. USvictor.t
    1. USvictor.t
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      1. POMatch texture coordinates to primitive size
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    1. COCan you clarify what the question is? I'm not sure what I'm supposed to take away from that image.
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      1. USTim
    2. COJust look at 't' letter in bottom of the image and 't' letter on top
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      1. USvictor.t
 

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