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SoftRasterizer / OpenGL Renderer: Drop less bits in the depth calculation, making for smoother depth transitions. For certain games, this may allow for better distance rendering, especially at the higher resolutions. (Related to commit c9025e8.) 

- SoftRasterizer may now drop at most one LSB, down from dropping 9 LSBs.
- OpenGL will now drop only 2 LSBs, down from 9 LSBs. In this case, dropping 2 LSBs was specifically chosen to ensure that the Dragon Quest IV overworld map continues to work.
- If this change makes the depth inaccuracy too much worse than before, then we may have to make these particular depth calculations optional in the future. This will need additional testing.
This commit is contained in:
rogerman 2018-11-17 23:20:59 -08:00
parent be8d08ae87
commit d81a75c867
3 changed files with 3 additions and 3 deletions
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2
desmume/src/OGLRender.cpp
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@ -336,7 +336,7 @@ static const char *GeometryFragShader_100 = {"\
float vertW = (vtxPosition.w == 0.0) ? 0.00000001 : vtxPosition.w;\n\
float depthOffset = (polyDepthOffsetMode == 0) ? 0.0 : ((polyDepthOffsetMode == 1) ? -DEPTH_EQUALS_TEST_TOLERANCE : DEPTH_EQUALS_TEST_TOLERANCE);\n\
// hack: when using z-depth, drop some LSBs so that the overworld map in Dragon Quest IV shows up correctly\n\
float newFragDepthValue = (stateUseWDepth) ? clamp( ( floor(vtxPosition.w * 4096.0) + depthOffset ) / 16777215.0, 0.0, 1.0 ) : clamp( ( (floor(clamp(((vtxPosition.z/vertW) * 0.5 + 0.5), 0.0, 1.0) * 32767.0) * 512.0) + depthOffset ) / 16777215.0, 0.0, 1.0 );\n\
float newFragDepthValue = (stateUseWDepth) ? clamp( ( (vtxPosition.w * 4096.0) + depthOffset ) / 16777215.0, 0.0, 1.0 ) : clamp( ( (floor(((vtxPosition.z/vertW) * 0.5 + 0.5) * 4194303.0) * 4.0) + depthOffset ) / 16777215.0, 0.0, 1.0 );\n\
\n\
if ((polyMode != 3) || polyDrawShadow)\n\
{\n\

2
desmume/src/OGLRender_3_2.cpp
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@ -207,7 +207,7 @@ static const char *GeometryFragShader_150 = {"\
float vertW = (vtxPosition.w == 0.0) ? 0.00000001 : vtxPosition.w;\n\
float depthOffset = (polyDepthOffsetMode == 0) ? 0.0 : ((polyDepthOffsetMode == 1) ? -DEPTH_EQUALS_TEST_TOLERANCE : DEPTH_EQUALS_TEST_TOLERANCE);\n\
// hack: when using z-depth, drop some LSBs so that the overworld map in Dragon Quest IV shows up correctly\n\
float newFragDepthValue = (state.useWDepth) ? clamp( ( floor(vtxPosition.w * 4096.0) + depthOffset ) / 16777215.0, 0.0, 1.0 ) : clamp( ( (floor(clamp(((vtxPosition.z/vertW) * 0.5 + 0.5), 0.0, 1.0) * 32767.0) * 512.0) + depthOffset ) / 16777215.0, 0.0, 1.0 );\n\
float newFragDepthValue = (state.useWDepth) ? clamp( ( (vtxPosition.w * 4096.0) + depthOffset ) / 16777215.0, 0.0, 1.0 ) : clamp( ( (floor(((vtxPosition.z/vertW) * 0.5 + 0.5) * 4194303.0) * 4.0) + depthOffset ) / 16777215.0, 0.0, 1.0 );\n\
\n\
if ((polyMode != 3u) || polyDrawShadow)\n\
{\n\

2
desmume/src/rasterize.cpp
View File

@ -517,7 +517,7 @@ FORCEINLINE void RasterizerUnit<RENDERER>::_pixel(const POLYGON_ATTR polyAttr, c
// When using z-depth, be sure to test against the following test cases:
// - The drawing of the overworld map in Dragon Quest IV
// - The drawing of all units on the map in Advance Wars: Days of Ruin
const u32 newDepth = (gfx3d.renderState.wbuffer) ? u32floor(4096*w) : (u32floor(z*0x7FFF) << 9);
const u32 newDepth = (gfx3d.renderState.wbuffer) ? u32floor(w * 4096.0f) : u32floor(z * 16777215.0f);
// run the depth test
bool depthFail = false;