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LightingShaderGen: Always calculate lighting for both color channels

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Cel-damage depends on lighting being calculated for the first channel
even though there is no color in the vertex format (defaults to the
material color). If lighting for the channel is not enabled, the vertex
will use the default color as before.

The default value of the color is determined by the number of elements in
the vertex format. This fixes the grey cubes in Super Mario Sunshine.

If the color channel count is zero, we set the color to black before the
end of the vertex shader. It's possible that this would be undefined
behavior on hardware if a vertex color index that was greater than the
channel count was used within TEV.
This commit is contained in:
Stenzek
2017-01-29 22:38:48 +10:00
committed by Pokechu22
parent fa73b1a23f
commit 51724c1ccd
11 changed files with 129 additions and 104 deletions
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46
Source/Core/VideoCommon/VertexShaderGen.cpp
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@ -191,6 +191,35 @@ ShaderCode GenerateVertexShaderCode(APIType api_type, const ShaderHostConfig& ho
out.Write("VS_OUTPUT o;\n");
// xfmem.numColorChans controls the number of color channels available to TEV, but we still need
// to generate all channels here, as it can be used in texgen. Cel-damage is an example of this.
out.Write("float4 vertex_color_0, vertex_color_1;\n");
// To use color 1, the vertex descriptor must have color 0 and 1.
// If color 1 is present but not color 0, it is used for lighting channel 0.
const bool use_color_1 =
(uid_data->components & (VB_HAS_COL0 | VB_HAS_COL1)) == (VB_HAS_COL0 | VB_HAS_COL1);
for (u32 color = 0; color < NUM_XF_COLOR_CHANNELS; color++)
{
if ((color == 0 || use_color_1) && (uid_data->components & (VB_HAS_COL0 << color)) != 0)
{
// Use color0 for channel 0, and color1 for channel 1 if both colors 0 and 1 are present.
out.Write("vertex_color_{0} = rawcolor{0};\n", color);
}
else if (color == 0 && (uid_data->components & VB_HAS_COL1) != 0)
{
// Use color1 for channel 0 if color0 is not present.
out.Write("vertex_color_{} = rawcolor1;\n", color);
}
else
{
// The default alpha channel depends on the number of components in the vertex format.
out.Write(
"vertex_color_{0} = float4(1.0, 1.0, 1.0, float((color_chan_alpha >> {0}) & 1u));\n",
color);
}
}
// transforms
if ((uid_data->components & VB_HAS_POSMTXIDX) != 0)
{
@ -256,8 +285,7 @@ ShaderCode GenerateVertexShaderCode(APIType api_type, const ShaderHostConfig& ho
"float3 ldir, h, cosAttn, distAttn;\n"
"float dist, dist2, attn;\n");
GenerateLightingShaderCode(out, uid_data->lighting, uid_data->components, "rawcolor",
"o.colors_");
GenerateLightingShaderCode(out, uid_data->lighting, "vertex_color_", "o.colors_");
// transform texcoords
out.Write("float4 coord = float4(0.0, 0.0, 1.0, 1.0);\n");
@ -434,11 +462,21 @@ ShaderCode GenerateVertexShaderCode(APIType api_type, const ShaderHostConfig& ho
out.Write("o.Normal = _norm0;\n"
"o.WorldPos = pos.xyz;\n");
// Pass through the vertex colors unmodified so we can evaluate the lighting in the same manner.
if ((uid_data->components & VB_HAS_COL0) != 0)
out.Write("o.colors_0 = rawcolor0;\n");
out.Write("o.colors_0 = vertex_color_0;\n");
if ((uid_data->components & VB_HAS_COL1) != 0)
out.Write("o.colors_1 = rawcolor1;\n");
out.Write("o.colors_1 = vertex_color_1;\n");
}
else
{
// The number of colors available to TEV is determined by numColorChans.
// We have to provide the fields to match the interface, so set to zero if it's not enabled.
if (uid_data->numColorChans == 0)
out.Write("o.colors_0 = float4(0.0, 0.0, 0.0, 0.0);\n");
if (uid_data->numColorChans <= 1)
out.Write("o.colors_1 = float4(0.0, 0.0, 0.0, 0.0);\n");
}
// If we can disable the incorrect depth clipping planes using depth clamping, then we can do