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GPU/HW: Only apply vertex offset at 1x resolution scale

This commit is contained in:
Connor McLaughlin 2020-04-23 14:45:11 +10:00
parent ea25b58dd3
commit 13e2b28f50
1 changed files with 7 additions and 2 deletions
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9
src/core/gpu_hw_shadergen.cpp
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@ -399,9 +399,14 @@ std::string GPU_HW_ShaderGen::GenerateBatchVertexShader(bool textured)
ss << R"(
{
// Offset the vertex position by 0.5 to ensure correct interpolation of texture coordinates
// at 1x resolution scale. This doesn't work at >1x, we adjust the texture coordinates before
// uploading there instead.
float vertex_offset = (RESOLUTION_SCALE == 1) ? 0.5 : 0.0;
// 0..+1023 -> -1..1
float pos_x = ((float(a_pos.x) + 0.5) / 512.0) - 1.0;
float pos_y = ((float(a_pos.y) + 0.5) / -256.0) + 1.0;
float pos_x = ((float(a_pos.x) + vertex_offset) / 512.0) - 1.0;
float pos_y = ((float(a_pos.y) + vertex_offset) / -256.0) + 1.0;
// OpenGL seems to be off by one pixel in the Y direction due to lower-left origin.
#if API_OPENGL || API_OPENGL_ES