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Use a clear texture instead of texture 0 (solid black) in the GL rasterizer (#4844)

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* Add OpenGLState.default_texture and set it to Clear in OpenGLRasterizer

* Localize the fix to the GL rasterizer

* Revert unwanted change
This commit is contained in:
Hamish Milne 2019-08-10 05:05:00 -04:00 committed by Ben
parent d80edd99d7
commit e3cefe5a5d
2 changed files with 17 additions and 2 deletions
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18
src/video_core/renderer_opengl/gl_rasterizer.cpp
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@ -66,6 +66,14 @@ RasterizerOpenGL::RasterizerOpenGL(Frontend::EmuWindow& window)
// Clipping plane 0 is always enabled for PICA fixed clip plane z <= 0
state.clip_distance[0] = true;
// Create a 1x1 clear texture to use in the NULL case,
// instead of OpenGL's default of solid black
glGenTextures(1, &default_texture);
glBindTexture(GL_TEXTURE_2D, default_texture);
// For some reason alpha 0 wraps around to 1.0, so use 1/255 instead
u8 framebuffer_data[4] = {0, 0, 0, 1};
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, framebuffer_data);
// Create sampler objects
for (std::size_t i = 0; i < texture_samplers.size(); ++i) {
texture_samplers[i].Create();
@ -756,10 +764,16 @@ bool RasterizerOpenGL::Draw(bool accelerate, bool is_indexed) {
surface->texture.handle);
} else {
// Can occur when texture addr is null or its memory is unmapped/invalid
state.texture_units[texture_index].texture_2d = 0;
// HACK: In this case, the correct behaviour for the PICA is to use the last
// rendered colour. But because this would be impractical to implement, the
// next best alternative is to use a clear texture, essentially skipping
// the geometry in question.
// For example: a bug in Pokemon X/Y causes NULL-texture squares to be drawn
// on the male character's face, which in the OpenGL default appear black.
state.texture_units[texture_index].texture_2d = default_texture;
}
} else {
state.texture_units[texture_index].texture_2d = 0;
state.texture_units[texture_index].texture_2d = default_texture;
}
}

1
src/video_core/renderer_opengl/gl_rasterizer.h
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@ -261,6 +261,7 @@ private:
bool is_amd;
OpenGLState state;
GLuint default_texture;
RasterizerCacheOpenGL res_cache;