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LibGL+LibSoftGPU: Implement glDrawPixels depth buffer support

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This enabled writing directly to the depth buffer, and allows games
like Grim Fandango to render their pre-baked depth buffers correctly!
This commit is contained in:
Jelle Raaijmakers 2022-01-12 17:08:59 +01:00 • committed by Andreas Kling
parent ca78327a96
commit 8efd6bc878
3 changed files with 52 additions and 15 deletions
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46
Userland/Libraries/LibGL/SoftwareGLContext.cpp
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@ -2243,26 +2243,42 @@ void SoftwareGLContext::gl_draw_pixels(GLsizei width, GLsizei height, GLenum for
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
// FIXME: we only support RGBA + GL_UNSIGNED_BYTE, implement all the others!
if (format != GL_RGBA) {
dbgln_if(GL_DEBUG, "gl_draw_pixels(): support for format {:#x} not implemented", format);
return;
} else if (type != GL_UNSIGNED_BYTE) {
dbgln_if(GL_DEBUG, "gl_draw_pixels(): support for type {:#x} not implemented", type);
// FIXME: we only support RGBA + UNSIGNED_BYTE and DEPTH_COMPONENT + UNSIGNED_SHORT, implement all combinations!
if (!((format == GL_RGBA && type == GL_UNSIGNED_BYTE) || (format == GL_DEPTH_COMPONENT && type == GL_UNSIGNED_SHORT))) {
dbgln_if(GL_DEBUG, "gl_draw_pixels(): support for format {:#x} and/or type {:#x} not implemented", format, type);
return;
}
auto bitmap_or_error = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, { width, height });
RETURN_WITH_ERROR_IF(bitmap_or_error.is_error(), GL_OUT_OF_MEMORY);
auto bitmap = bitmap_or_error.release_value();
// FIXME: implement support for pixel parameters such as GL_UNPACK_ALIGNMENT
// FIXME: implement support for GL_UNPACK_ALIGNMENT and other pixel parameters
auto pixel_data = static_cast<u32 const*>(data);
for (int y = 0; y < height; ++y)
for (int x = 0; x < width; ++x)
bitmap->set_pixel(x, y, Color::from_rgba(*(pixel_data++)));
if (format == GL_RGBA) {
auto bitmap_or_error = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, { width, height });
RETURN_WITH_ERROR_IF(bitmap_or_error.is_error(), GL_OUT_OF_MEMORY);
auto bitmap = bitmap_or_error.release_value();
m_rasterizer.blit_to_color_buffer_at_raster_position(bitmap);
auto pixel_data = static_cast<u32 const*>(data);
for (int y = 0; y < height; ++y)
for (int x = 0; x < width; ++x)
bitmap->set_pixel(x, y, Color::from_rgba(*(pixel_data++)));
m_rasterizer.blit_to_color_buffer_at_raster_position(bitmap);
} else if (format == GL_DEPTH_COMPONENT) {
Vector<float> depth_values;
depth_values.ensure_capacity(width * height);
auto depth_data = static_cast<u16 const*>(data);
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
auto u16_value = *(depth_data++);
auto float_value = static_cast<float>(u16_value) / NumericLimits<u16>::max();
depth_values.append(float_value);
}
}
m_rasterizer.blit_to_depth_buffer_at_raster_position(depth_values, width, height);
} else {
VERIFY_NOT_REACHED();
}
}
void SoftwareGLContext::gl_depth_range(GLdouble min, GLdouble max)