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