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/*
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "Clipper.h"
#include "GLContext.h"
#include "GLStruct.h"
#include "SoftwareRasterizer.h"
#include <AK/RefPtr.h>
#include <AK/Tuple.h>
#include <AK/Variant.h>
#include <AK/Vector.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Matrix4x4.h>
#include <LibGfx/Vector3.h>
namespace GL {
class SoftwareGLContext : public GLContext {
public:
SoftwareGLContext(Gfx::Bitmap&);
virtual void gl_begin(GLenum mode) override;
virtual void gl_clear(GLbitfield mask) override;
virtual void gl_clear_color(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha) override;
virtual void gl_clear_depth(GLdouble depth) override;
virtual void gl_color(GLdouble r, GLdouble g, GLdouble b, GLdouble a) override;
virtual void gl_end() override;
virtual void gl_frustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val) override;
virtual GLenum gl_get_error() override;
virtual GLubyte* gl_get_string(GLenum name) override;
virtual void gl_load_identity() override;
virtual void gl_load_matrix(const FloatMatrix4x4& matrix) override;
virtual void gl_matrix_mode(GLenum mode) override;
virtual void gl_ortho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val) override;
virtual void gl_push_matrix() override;
virtual void gl_pop_matrix() override;
virtual void gl_rotate(GLdouble angle, GLdouble x, GLdouble y, GLdouble z) override;
virtual void gl_scale(GLdouble x, GLdouble y, GLdouble z) override;
virtual void gl_translate(GLdouble x, GLdouble y, GLdouble z) override;
virtual void gl_vertex(GLdouble x, GLdouble y, GLdouble z, GLdouble w) override;
virtual void gl_viewport(GLint x, GLint y, GLsizei width, GLsizei height) override;
virtual void gl_enable(GLenum) override;
virtual void gl_disable(GLenum) override;
virtual void gl_front_face(GLenum) override;
virtual void gl_cull_face(GLenum) override;
virtual GLuint gl_gen_lists(GLsizei range) override;
virtual void gl_call_list(GLuint list) override;
virtual void gl_delete_lists(GLuint list, GLsizei range) override;
virtual void gl_end_list(void) override;
virtual void gl_new_list(GLuint list, GLenum mode) override;
virtual void gl_flush() override;
virtual void gl_finish() override;
virtual void gl_blend_func(GLenum src_factor, GLenum dst_factor) override;
virtual void gl_shade_model(GLenum mode) override;
virtual void gl_alpha_func(GLenum func, GLclampf ref) override;
virtual void gl_hint(GLenum target, GLenum mode) override;
virtual void gl_read_buffer(GLenum mode) override;
virtual void present() override;
private:
template<typename T>
T* store_in_listing(T value)
{
VERIFY(m_current_listing_index.has_value());
auto& listing = m_current_listing_index->listing;
listing.saved_arguments.empend(make<Listing::ExtraSavedArguments>(move(value)));
return listing.saved_arguments.last()->template get_pointer<T>();
}
template<auto member, typename... Args>
void append_to_listing(Args&&... args)
{
VERIFY(m_current_listing_index.has_value());
m_current_listing_index->listing.entries.empend(member, Listing::ArgumentsFor<member> { forward<Args>(args)... });
}
[[nodiscard]] bool should_append_to_listing() const { return m_current_listing_index.has_value(); }
[[nodiscard]] bool should_execute_after_appending_to_listing() const { return m_current_listing_index.has_value() && m_current_listing_index->mode == GL_COMPILE_AND_EXECUTE; }
GLenum m_current_draw_mode;
GLenum m_current_matrix_mode;
FloatMatrix4x4 m_projection_matrix;
FloatMatrix4x4 m_model_view_matrix;
FloatMatrix4x4 m_current_matrix;
Vector<FloatMatrix4x4> m_projection_matrix_stack;
Vector<FloatMatrix4x4> m_model_view_matrix_stack;
FloatVector4 m_clear_color = { 0.0f, 0.0f, 0.0f, 0.0f };
double m_clear_depth = { 1.0 };
FloatVector4 m_current_vertex_color = { 1.0f, 1.0f, 1.0f, 1.0f };
Vector<GLVertex, 96> vertex_list;
Vector<GLTriangle, 32> triangle_list;
Vector<GLTriangle, 32> processed_triangles;
GLenum m_error = GL_NO_ERROR;
bool m_in_draw_state = false;
bool m_depth_test_enabled = false;
bool m_cull_faces = false;
GLenum m_front_face = GL_CCW;
GLenum m_culled_sides = GL_BACK;
bool m_blend_enabled = false;
GLenum m_blend_source_factor = GL_ONE;
GLenum m_blend_destination_factor = GL_ZERO;
bool m_alpha_test_enabled = false;
GLenum m_alpha_test_func = GL_ALWAYS;
GLclampf m_alpha_test_ref_value = 0;
GLenum m_current_read_buffer = GL_BACK;
NonnullRefPtr<Gfx::Bitmap> m_frontbuffer;
Clipper m_clipper;
SoftwareRasterizer m_rasterizer;
struct Listing {
template<typename F>
struct TupleTypeForArgumentListOf_;
template<typename Ret, typename C, typename... Args>
struct TupleTypeForArgumentListOf_<Ret (C::*)(Args...)> {
using Type = Tuple<Args...>;
};
template<typename F>
using TupleTypeForArgumentListOf = typename TupleTypeForArgumentListOf_<F>::Type;
template<auto member>
using ArgumentsFor = TupleTypeForArgumentListOf<decltype(member)>;
template<typename... Fns>
struct FunctionAndArgs {
Variant<Fns...> function;
Variant<TupleTypeForArgumentListOf<Fns>...> arguments;
};
using FunctionsAndArgs = FunctionAndArgs<
decltype(&SoftwareGLContext::gl_begin),
decltype(&SoftwareGLContext::gl_clear),
decltype(&SoftwareGLContext::gl_clear_color),
decltype(&SoftwareGLContext::gl_clear_depth),
decltype(&SoftwareGLContext::gl_color),
decltype(&SoftwareGLContext::gl_end),
decltype(&SoftwareGLContext::gl_frustum),
decltype(&SoftwareGLContext::gl_load_identity),
decltype(&SoftwareGLContext::gl_load_matrix),
decltype(&SoftwareGLContext::gl_matrix_mode),
decltype(&SoftwareGLContext::gl_ortho),
decltype(&SoftwareGLContext::gl_push_matrix),
decltype(&SoftwareGLContext::gl_pop_matrix),
decltype(&SoftwareGLContext::gl_rotate),
decltype(&SoftwareGLContext::gl_scale),
decltype(&SoftwareGLContext::gl_translate),
decltype(&SoftwareGLContext::gl_vertex),
decltype(&SoftwareGLContext::gl_viewport),
decltype(&SoftwareGLContext::gl_enable),
decltype(&SoftwareGLContext::gl_disable),
decltype(&SoftwareGLContext::gl_front_face),
decltype(&SoftwareGLContext::gl_cull_face),
decltype(&SoftwareGLContext::gl_call_list),
decltype(&SoftwareGLContext::gl_blend_func),
decltype(&SoftwareGLContext::gl_shade_model),
decltype(&SoftwareGLContext::gl_alpha_func),
decltype(&SoftwareGLContext::gl_hint),
decltype(&SoftwareGLContext::gl_read_buffer)>;
using ExtraSavedArguments = Variant<
FloatMatrix4x4>;
Vector<NonnullOwnPtr<ExtraSavedArguments>> saved_arguments;
Vector<FunctionsAndArgs> entries;
};
static constexpr size_t max_allowed_gl_call_depth { 128 };
size_t m_gl_call_depth { 0 };
Vector<Listing> m_listings;
struct CurrentListing {
Listing listing;
size_t index { 0 };
GLenum mode { GL_COMPILE };
};
Optional<CurrentListing> m_current_listing_index;
};
}
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