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LibGL: Move blending functions to a separate unit

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This commit is contained in:
Jelle Raaijmakers 2024-04-09 22:54:30 +02:00 • committed by Tim Schumacher
commit f3d3454976
Notes: sideshowbarker 2024-07-16 22:24:48 +09:00
3 changed files with 136 additions and 124 deletions
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135
Userland/Libraries/LibGL/Blending.cpp Normal file
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/*
* Copyright (c) 2024, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGL/GLContext.h>
namespace GL {
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);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
// FIXME: The list of allowed enums differs between API versions
// This was taken from the 2.0 spec on https://docs.gl/gl2/glBlendFunc
RETURN_WITH_ERROR_IF(!(src_factor == GL_ZERO
|| src_factor == GL_ONE
|| src_factor == GL_SRC_COLOR
|| src_factor == GL_ONE_MINUS_SRC_COLOR
|| src_factor == GL_DST_COLOR
|| src_factor == GL_ONE_MINUS_DST_COLOR
|| src_factor == GL_SRC_ALPHA
|| src_factor == GL_ONE_MINUS_SRC_ALPHA
|| src_factor == GL_DST_ALPHA
|| src_factor == GL_ONE_MINUS_DST_ALPHA
|| src_factor == GL_CONSTANT_COLOR
|| src_factor == GL_ONE_MINUS_CONSTANT_COLOR
|| src_factor == GL_CONSTANT_ALPHA
|| src_factor == GL_ONE_MINUS_CONSTANT_ALPHA
|| src_factor == GL_SRC_ALPHA_SATURATE),
GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(dst_factor == GL_ZERO
|| dst_factor == GL_ONE
|| dst_factor == GL_SRC_COLOR
|| dst_factor == GL_ONE_MINUS_SRC_COLOR
|| dst_factor == GL_DST_COLOR
|| dst_factor == GL_ONE_MINUS_DST_COLOR
|| dst_factor == GL_SRC_ALPHA
|| dst_factor == GL_ONE_MINUS_SRC_ALPHA
|| dst_factor == GL_DST_ALPHA
|| dst_factor == GL_ONE_MINUS_DST_ALPHA
|| dst_factor == GL_CONSTANT_COLOR
|| dst_factor == GL_ONE_MINUS_CONSTANT_COLOR
|| dst_factor == GL_CONSTANT_ALPHA
|| dst_factor == GL_ONE_MINUS_CONSTANT_ALPHA),
GL_INVALID_ENUM);
m_blend_source_factor = src_factor;
m_blend_destination_factor = dst_factor;
auto map_gl_blend_factor_to_device = [](GLenum factor) constexpr {
switch (factor) {
case GL_ZERO:
return GPU::BlendFactor::Zero;
case GL_ONE:
return GPU::BlendFactor::One;
case GL_SRC_COLOR:
return GPU::BlendFactor::SrcColor;
case GL_ONE_MINUS_SRC_COLOR:
return GPU::BlendFactor::OneMinusSrcColor;
case GL_DST_COLOR:
return GPU::BlendFactor::DstColor;
case GL_ONE_MINUS_DST_COLOR:
return GPU::BlendFactor::OneMinusDstColor;
case GL_SRC_ALPHA:
return GPU::BlendFactor::SrcAlpha;
case GL_ONE_MINUS_SRC_ALPHA:
return GPU::BlendFactor::OneMinusSrcAlpha;
case GL_DST_ALPHA:
return GPU::BlendFactor::DstAlpha;
case GL_ONE_MINUS_DST_ALPHA:
return GPU::BlendFactor::OneMinusDstAlpha;
case GL_SRC_ALPHA_SATURATE:
return GPU::BlendFactor::SrcAlphaSaturate;
default:
VERIFY_NOT_REACHED();
}
};
auto options = m_rasterizer->options();
options.blend_source_factor = map_gl_blend_factor_to_device(m_blend_source_factor);
options.blend_destination_factor = map_gl_blend_factor_to_device(m_blend_destination_factor);
m_rasterizer->set_options(options);
}
}