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LibGL: Implement glReadBuffer()

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This commit is contained in:
Stephan Unverwerth 2021-05-24 15:24:49 +02:00 committed by Linus Groh
parent 0c6f019285
commit 24e74750d5
Notes: sideshowbarker 2024-07-18 17:27:30 +09:00 
Author: https://github.com/sunverwerth
Commit: https://github.com/SerenityOS/serenity/commit/24e74750d5c
Pull-request: https://github.com/SerenityOS/serenity/pull/7450
5 changed files with 60 additions and 2 deletions
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9
Userland/Libraries/LibGL/GL/gl.h
View file

@ -73,9 +73,15 @@ extern "C" {
#define GL_ONE_MINUS_DST_COLOR 0x0307
#define GL_SRC_ALPHA_SATURATE 0x0308
// Culled face side
// Sides
#define GL_FRONT_LEFT 0x0400
#define GL_FRONT_RIGHT 0x0401
#define GL_BACK_LEFT 0x0402
#define GL_BACK_RIGHT 0x0403
#define GL_FRONT 0x0404
#define GL_BACK 0x0405
#define GL_LEFT 0x0406
#define GL_RIGHT 0x0407
#define GL_FRONT_AND_BACK 0x0408
// Error codes
@ -204,6 +210,7 @@ GLAPI void glBlendFunc(GLenum sfactor, GLenum dfactor);
GLAPI void glShadeModel(GLenum mode);
GLAPI void glAlphaFunc(GLenum func, GLclampf ref);
GLAPI void glHint(GLenum target, GLenum mode);
GLAPI void glReadBuffer(GLenum mode);
#ifdef __cplusplus
}

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

@ -53,6 +53,7 @@ public:
virtual void gl_shade_model(GLenum mode) = 0;
virtual void gl_alpha_func(GLenum func, GLclampf ref) = 0;
virtual void gl_hint(GLenum target, GLenum mode) = 0;
virtual void gl_read_buffer(GLenum mode) = 0;
virtual void present() = 0;
};

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

@ -74,3 +74,8 @@ void glHint(GLenum target, GLenum mode)
{
g_gl_context->gl_hint(target, mode);
}
void glReadBuffer(GLenum mode)
{
g_gl_context->gl_read_buffer(mode);
}

41
Userland/Libraries/LibGL/SoftwareGLContext.cpp
View file

@ -1009,6 +1009,47 @@ void SoftwareGLContext::gl_hint(GLenum target, GLenum mode)
// According to the spec implementors are free to ignore glHint. So we do.
}
void SoftwareGLContext::gl_read_buffer(GLenum mode)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_read_buffer, mode);
if (m_in_draw_state) {
m_error = GL_INVALID_OPERATION;
return;
}
// FIXME: Also allow aux buffers GL_AUX0 through GL_AUX3 here
// plus any aux buffer between 0 and GL_AUX_BUFFERS
if (mode != GL_FRONT_LEFT
&& mode != GL_FRONT_RIGHT
&& mode != GL_BACK_LEFT
&& mode != GL_BACK_RIGHT
&& mode != GL_FRONT
&& mode != GL_BACK
&& mode != GL_LEFT
&& mode != GL_RIGHT) {
m_error = GL_INVALID_ENUM;
return;
}
// FIXME: We do not currently have aux buffers, so make it an invalid
// operation to select anything but front or back buffers. Also we do
// not allow selecting the stereoscopic RIGHT buffers since we do not
// have them configured.
if (mode != GL_FRONT_LEFT
&& mode != GL_FRONT
&& mode != GL_BACK_LEFT
&& mode != GL_BACK
&& mode != GL_FRONT
&& mode != GL_BACK
&& mode != GL_LEFT) {
m_error = GL_INVALID_OPERATION;
return;
}
m_current_read_buffer = mode;
}
void SoftwareGLContext::present()
{
m_rasterizer.blit_to(*m_frontbuffer);

6
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -59,6 +59,7 @@ public:
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;
@ -117,6 +118,8 @@ private:
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;
@ -172,7 +175,8 @@ private:
decltype(&SoftwareGLContext::gl_blend_func),
decltype(&SoftwareGLContext::gl_shade_model),
decltype(&SoftwareGLContext::gl_alpha_func),
decltype(&SoftwareGLContext::gl_hint)>;
decltype(&SoftwareGLContext::gl_hint),
decltype(&SoftwareGLContext::gl_read_buffer)>;
using ExtraSavedArguments = Variant<
FloatMatrix4x4>;