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LibGL: Implement glAlphaFunc()

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This implements glAlphaFunc() for setting alpha test func and ref value
and also allows enabling and disabling GL_ALPHA_TEST
This commit is contained in:
Stephan Unverwerth 2021-05-16 16:43:09 +02:00 committed by Andreas Kling
parent b8b8b4b566
commit 1bd754882d
Notes: sideshowbarker 2024-07-18 18:01:24 +09:00 
Author: https://github.com/sunverwerth
Commit: https://github.com/SerenityOS/serenity/commit/1bd754882dd
Pull-request: https://github.com/SerenityOS/serenity/pull/7181
6 changed files with 68 additions and 2 deletions
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20
Userland/Libraries/LibGL/GL/gl.h
View file

@ -29,6 +29,16 @@ extern "C" {
#define GL_TRIANGLE_STRIP 0x0103
#define GL_POLYGON 0x0104
// Depth buffer and alpha test compare functions
#define GL_NEVER 0x0200
#define GL_LESS 0x0201
#define GL_EQUAL 0x0202
#define GL_LEQUAL 0x0203
#define GL_GREATER 0x0204
#define GL_NOTEQUAL 0x0205
#define GL_GEQUAL 0x0206
#define GL_ALWAYS 0x0207
// Buffer bits
#define GL_COLOR_BUFFER_BIT 0x0200
#define GL_DEPTH_BUFFER_BIT 0x0400
@ -36,6 +46,13 @@ extern "C" {
// Enable capabilities
#define GL_CULL_FACE 0x0B44
#define GL_DEPTH_TEST 0x0B71
// Alpha testing
#define GL_ALPHA_TEST 0x0BC0
#define GL_ALPHA_TEST_REF 0x0BC2
#define GL_ALPHA_TEST_FUNC 0x0BC1
// Alpha blending
#define GL_BLEND 0x0BE2
// Utility
@ -43,7 +60,7 @@ extern "C" {
#define GL_RENDERER 0x1F01
#define GL_VERSION 0x1F02
/* Blend factors */
// Blend factors
#define GL_ZERO 0
#define GL_ONE 1
#define GL_SRC_COLOR 0x0300
@ -152,6 +169,7 @@ GLAPI void glFlush();
GLAPI void glFinish();
GLAPI void glBlendFunc(GLenum sfactor, GLenum dfactor);
GLAPI void glShadeModel(GLenum mode);
GLAPI void glAlphaFunc(GLenum func, GLclampf ref);
#ifdef __cplusplus
}

5
Userland/Libraries/LibGL/GLBlend.cpp
View file

@ -13,3 +13,8 @@ void glBlendFunc(GLenum sfactor, GLenum dfactor)
{
return g_gl_context->gl_blend_func(sfactor, dfactor);
}
void glAlphaFunc(GLenum func, GLclampf ref)
{
return g_gl_context->gl_alpha_func(func, ref);
}

1
Userland/Libraries/LibGL/GLContext.h
View file

@ -51,6 +51,7 @@ public:
virtual void gl_finish() = 0;
virtual void gl_blend_func(GLenum src_factor, GLenum dst_factor) = 0;
virtual void gl_shade_model(GLenum mode) = 0;
virtual void gl_alpha_func(GLenum func, GLclampf ref) = 0;
virtual void present() = 0;
};

33
Userland/Libraries/LibGL/SoftwareGLContext.cpp
View file

@ -688,6 +688,11 @@ void SoftwareGLContext::gl_enable(GLenum capability)
rasterizer_options.enable_blending = true;
update_rasterizer_options = true;
break;
case GL_ALPHA_TEST:
m_alpha_test_enabled = true;
rasterizer_options.enable_alpha_test = true;
update_rasterizer_options = true;
break;
default:
m_error = GL_INVALID_ENUM;
break;
@ -723,6 +728,11 @@ void SoftwareGLContext::gl_disable(GLenum capability)
rasterizer_options.enable_blending = false;
update_rasterizer_options = false;
break;
case GL_ALPHA_TEST:
m_alpha_test_enabled = false;
rasterizer_options.enable_alpha_test = false;
update_rasterizer_options = false;
break;
default:
m_error = GL_INVALID_ENUM;
break;
@ -946,6 +956,29 @@ void SoftwareGLContext::gl_shade_model(GLenum mode)
m_rasterizer.set_options(options);
}
void SoftwareGLContext::gl_alpha_func(GLenum func, GLclampf ref)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_alpha_func, func, ref);
if (m_in_draw_state) {
m_error = GL_INVALID_OPERATION;
return;
}
if (func < GL_NEVER || func > GL_ALWAYS) {
m_error = GL_INVALID_ENUM;
return;
}
m_alpha_test_func = func;
m_alpha_test_ref_value = ref;
auto options = m_rasterizer.options();
options.alpha_test_func = m_alpha_test_func;
options.alpha_test_ref_value = m_alpha_test_ref_value;
m_rasterizer.set_options(options);
}
void SoftwareGLContext::present()
{
m_rasterizer.blit_to(*m_frontbuffer);

8
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -57,6 +57,7 @@ public:
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 present() override;
@ -111,6 +112,10 @@ private:
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;
NonnullRefPtr<Gfx::Bitmap> m_frontbuffer;
Clipper m_clipper;
@ -164,7 +169,8 @@ private:
decltype(&SoftwareGLContext::gl_cull_face),
decltype(&SoftwareGLContext::gl_call_list),
decltype(&SoftwareGLContext::gl_blend_func),
decltype(&SoftwareGLContext::gl_shade_model)>;
decltype(&SoftwareGLContext::gl_shade_model),
decltype(&SoftwareGLContext::gl_alpha_func)>;
using ExtraSavedArguments = Variant<
FloatMatrix4x4>;

3
Userland/Libraries/LibGL/SoftwareRasterizer.h
View file

@ -18,6 +18,9 @@ namespace GL {
struct RasterizerOptions {
bool shade_smooth { true };
bool enable_depth_test { false };
bool enable_alpha_test { false };
GLenum alpha_test_func { GL_ALWAYS };
float alpha_test_ref_value { 0 };
bool enable_blending { false };
GLenum blend_source_factor { GL_ONE };
GLenum blend_destination_factor { GL_ONE };