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LibGL+LibGPU+LibSoftGPU: Implement blend equations

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This implements support for `glBlendEquation` and
`glBlendEquationSeparate`. These functions modify the calculation of the
resulting color in blending mode.
This commit is contained in:
Jelle Raaijmakers 2024-02-15 22:55:28 +01:00
parent 55668c3e48
commit aa3a6767f6
10 changed files with 202 additions and 30 deletions
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46
Userland/Libraries/LibGL/GLContext.cpp
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@ -1,7 +1,7 @@
/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
* Copyright (c) 2022-2023, Jelle Raaijmakers <jelle@gmta.nl>
* Copyright (c) 2022-2024, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -261,6 +261,50 @@ void GLContext::gl_finish()
// No-op since GLContext is completely synchronous at the moment
}
void GLContext::gl_blend_equation_separate(GLenum rgb_mode, GLenum alpha_mode)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_blend_equation_separate, rgb_mode, alpha_mode);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(!(rgb_mode == GL_FUNC_ADD
|| rgb_mode == GL_FUNC_SUBTRACT
|| rgb_mode == GL_FUNC_REVERSE_SUBTRACT
|| rgb_mode == GL_MIN
|| rgb_mode == GL_MAX),
GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(alpha_mode == GL_FUNC_ADD
|| alpha_mode == GL_FUNC_SUBTRACT
|| alpha_mode == GL_FUNC_REVERSE_SUBTRACT
|| alpha_mode == GL_MIN
|| alpha_mode == GL_MAX),
GL_INVALID_ENUM);
m_blend_equation_rgb = rgb_mode;
m_blend_equation_alpha = alpha_mode;
auto map_gl_blend_equation_to_device = [](GLenum equation) constexpr {
switch (equation) {
case GL_FUNC_ADD:
return GPU::BlendEquation::Add;
case GL_FUNC_SUBTRACT:
return GPU::BlendEquation::Subtract;
case GL_FUNC_REVERSE_SUBTRACT:
return GPU::BlendEquation::ReverseSubtract;
case GL_MIN:
return GPU::BlendEquation::Min;
case GL_MAX:
return GPU::BlendEquation::Max;
default:
VERIFY_NOT_REACHED();
}
};
auto options = m_rasterizer->options();
options.blend_equation_rgb = map_gl_blend_equation_to_device(m_blend_equation_rgb);
options.blend_equation_alpha = map_gl_blend_equation_to_device(m_blend_equation_alpha);
m_rasterizer->set_options(options);
}
void GLContext::gl_blend_func(GLenum src_factor, GLenum dst_factor)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_blend_func, src_factor, dst_factor);