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GPU/HW/OpenGL: Work around vertex-Y-off-by-one issue

This commit is contained in:
Connor McLaughlin 2020-04-22 17:39:46 +10:00
parent ec5b52b3fb
commit d7aa514f14
1 changed files with 12 additions and 4 deletions
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16
src/core/gpu_hw_shadergen.cpp
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@ -400,18 +400,26 @@ std::string GPU_HW_ShaderGen::GenerateBatchVertexShader(bool textured)
ss << R"(
{
// 0..+1023 -> -1..1
float pos_x = ((float(a_pos.x) + 0.5) / 1024.0);
float pos_y = ((float(a_pos.y) + 0.5) / 512.0);
pos_x = (pos_x * 2.0) - 1.0;
pos_y = ((1.0 - pos_y) * 2.0) - 1.0;
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;
// OpenGL seems to be off by one pixel in the Y direction due to lower-left origin.
#if API_OPENGL || API_OPENGL_ES
pos_y += (1.0 / 512.0);
#endif
v_pos = float4(pos_x, pos_y, 0.0, 1.0);
v_col0 = a_col0;
#if TEXTURED
// Fudge the texture coordinates by half a pixel in screen-space.
// This fixes the rounding/interpolation error on NVIDIA GPUs with shared edges between triangles.
#if API_OPENGL || API_OPENGL_ES
v_tex0 = float2(float(a_texcoord & 0xFFFF) + (RCP_VRAM_SIZE.x * 0.5),
float(a_texcoord >> 16) - (RCP_VRAM_SIZE.y * 0.5));
#else
v_tex0 = float2(float(a_texcoord & 0xFFFF) + (RCP_VRAM_SIZE.x * 0.5),
float(a_texcoord >> 16) + (RCP_VRAM_SIZE.y * 0.5));
#endif
// base_x,base_y,palette_x,palette_y
v_texpage.x = (a_texpage & 15) * 64 * RESOLUTION_SCALE;