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MYST3: Explain the texture size workaround used in the ES2 renderer

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This commit is contained in:
Bastien Bouclet 2014-02-11 20:11:23 +01:00
parent 2d37561276
commit 61968c6341
1 changed files with 8 additions and 0 deletions
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8
engines/myst3/gfx_opengl_shaders.cpp
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@ -347,6 +347,14 @@ void ShaderRenderer::drawCube(Texture **textures) {
glEnable(GL_TEXTURE_2D);
glDepthMask(GL_FALSE);
// WORKAROUND: The texture scale is set to a slightly incorrect value below,
// (the "texture0->width - 1" part should be just "texture0->width"), in order
// to work around a white line appearing along the edges of the cube due
// enabling linear filtering on partially used textures, resulting in the
// unused part leaking into the used part.
// FIXME: This causes a very subtle misalignment between the videos blended
// into the scenes and the background.
_cube_shader->use();
_cube_shader->setUniform1f("verScale", 256.0f);
_cube_shader->setUniform1f("texScale", (texture0->width - 1) / (float) texture0->internalWidth);