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rsx: Fix clip space computations

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kd-11 2017-06-14 18:47:01 +03:00
parent 75964c686f
commit 98cf72e0fb
6 changed files with 20 additions and 20 deletions
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14
rpcs3/Emu/RSX/GL/GLVertexProgram.cpp
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@ -375,6 +375,20 @@ void GLVertexDecompilerThread::insertMainEnd(std::stringstream & OS)
OS << " front_spec_color = dst_reg2;\n";
OS << " gl_Position = gl_Position * scaleOffsetMat;" << std::endl;
//Since our clip_space is symetrical [-1, 1] we map it to linear space using the eqn:
//ln = (clip * 2) - 1 to fully utilize the 0-1 range of the depth buffer
//RSX matrices passed already map to the [0, 1] range but mapping to classic OGL requires that we undo this step
//This can be made unnecessary using the call glClipControl(GL_LOWER_LEFT, GL_ZERO_TO_ONE).
//However, ClipControl only made it to opengl core in ver 4.5 though, so this is a workaround.
//NOTE: It is completely valid for games to use very large w values, causing the post-multiplied z to be in the hundreds
//It is therefore critical that this step is done post-transform and the result re-scaled by w
//SEE Naruto: UNS
OS << " float ndc_z = gl_Position.z / gl_Position.w;" << std::endl;
OS << " ndc_z = (ndc_z * 2.) - 1.;" << std::endl;
OS << " gl_Position.z = ndc_z * gl_Position.w;" << std::endl;
OS << "}" << std::endl;
}