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EFB2RAM: Apply copy filter as a float coefficient after sampling

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Using 8-bit integer math here lead to precision loss for depth copies,
which broke various effects in games, e.g. lens flare in MK:DD.

It's unlikely the console implements this as a floating-point multiply
(fixed-point perhaps), but since we have the float round trip in our
EFB2RAM shaders anyway, it's not going to make things any worse. If we
do rewrite our shaders to use integer math completely, then it might be
worth switching this conversion back to integers.

However, the range of the values (format) should be known, or we should
expand all values out to 24-bits first.
This commit is contained in:
Stenzek
2018-05-22 12:14:48 +10:00
parent 59be5da24c
commit f74dbc794c
10 changed files with 38 additions and 35 deletions
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6
Source/Core/VideoBackends/OGL/TextureConverter.cpp
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@ -50,7 +50,7 @@ std::unique_ptr<AbstractStagingTexture> s_encoding_readback_texture;
const int renderBufferWidth = EFB_WIDTH * 4;
const int renderBufferHeight = 1024;
}
} // namespace
static EncodingProgram& GetOrCreateEncodingShader(const EFBCopyParams& params)
{
@ -158,7 +158,7 @@ void EncodeToRamFromTexture(u8* dest_ptr, const EFBCopyParams& params, u32 nativ
glUniform1f(texconv_shader.y_scale_uniform, y_scale);
glUniform1f(texconv_shader.gamma_rcp_uniform, 1.0f / gamma);
glUniform2f(texconv_shader.clamp_tb_uniform, clamp_top, clamp_bottom);
glUniform3i(texconv_shader.filter_coefficients_uniform, filter_coefficients[0],
glUniform3f(texconv_shader.filter_coefficients_uniform, filter_coefficients[0],
filter_coefficients[1], filter_coefficients[2]);
const GLuint read_texture = params.depth ?
@ -171,6 +171,6 @@ void EncodeToRamFromTexture(u8* dest_ptr, const EFBCopyParams& params, u32 nativ
g_renderer->RestoreAPIState();
}
} // namespace
} // namespace TextureConverter
} // namespace OGL