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LibGL: Implement glDrawBuffer

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This commit is contained in:
Stephan Unverwerth 2021-08-31 20:23:29 +02:00 • committed by Ali Mohammad Pur
parent b069c1306c
commit 7cbaaf8366
7 changed files with 52 additions and 1 deletions
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2
Userland/Libraries/LibGL/GL/gl.h
View file

@ -25,6 +25,7 @@ extern "C" {
// OpenGL related `defines`
#define GL_TRUE 1
#define GL_FALSE 0
#define GL_NONE 0
// Matrix Modes
#define GL_MODELVIEW 0x0050
@ -352,6 +353,7 @@ GLAPI void glShadeModel(GLenum mode);
GLAPI void glAlphaFunc(GLenum func, GLclampf ref);
GLAPI void glHint(GLenum target, GLenum mode);
GLAPI void glReadBuffer(GLenum mode);
GLAPI void glDrawBuffer(GLenum buffer);
GLAPI void glReadPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* pixels);
GLAPI void glTexImage2D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* data);
GLAPI void glTexCoord2f(GLfloat s, GLfloat t);

1
Userland/Libraries/LibGL/GLContext.h
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@ -56,6 +56,7 @@ public:
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 gl_draw_buffer(GLenum buffer) = 0;
virtual void gl_read_pixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* pixels) = 0;
virtual void gl_tex_image_2d(GLenum target, GLint level, GLint internal_format, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* data) = 0;
virtual void gl_tex_parameter(GLenum target, GLenum pname, GLfloat param) = 0;

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

@ -85,6 +85,11 @@ void glReadBuffer(GLenum mode)
g_gl_context->gl_read_buffer(mode);
}
void glDrawBuffer(GLenum buffer)
{
g_gl_context->gl_draw_buffer(buffer);
}
void glReadPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* pixels)
{
g_gl_context->gl_read_pixels(x, y, width, height, format, type, pixels);

40
Userland/Libraries/LibGL/SoftwareGLContext.cpp
View file

@ -960,6 +960,46 @@ void SoftwareGLContext::gl_read_buffer(GLenum mode)
m_current_read_buffer = mode;
}
void SoftwareGLContext::gl_draw_buffer(GLenum buffer)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_draw_buffer, buffer);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
// FIXME: Also allow aux buffers GL_AUX0 through GL_AUX3 here
// plus any aux buffer between 0 and GL_AUX_BUFFERS
RETURN_WITH_ERROR_IF(buffer != GL_NONE
&& buffer != GL_FRONT_LEFT
&& buffer != GL_FRONT_RIGHT
&& buffer != GL_BACK_LEFT
&& buffer != GL_BACK_RIGHT
&& buffer != GL_FRONT
&& buffer != GL_BACK
&& buffer != GL_LEFT
&& buffer != GL_RIGHT,
GL_INVALID_ENUM);
// 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.
RETURN_WITH_ERROR_IF(buffer != GL_NONE
&& buffer != GL_FRONT_LEFT
&& buffer != GL_FRONT
&& buffer != GL_BACK_LEFT
&& buffer != GL_BACK
&& buffer != GL_FRONT
&& buffer != GL_BACK
&& buffer != GL_LEFT,
GL_INVALID_OPERATION);
m_current_draw_buffer = buffer;
auto rasterizer_options = m_rasterizer.options();
rasterizer_options.draw_buffer = m_current_draw_buffer;
m_rasterizer.set_options(rasterizer_options);
}
void SoftwareGLContext::gl_read_pixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* pixels)
{
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);

2
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -66,6 +66,7 @@ public:
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 gl_draw_buffer(GLenum buffer) override;
virtual void gl_read_pixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* pixels) override;
virtual void gl_tex_image_2d(GLenum target, GLint level, GLint internal_format, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* data) override;
virtual void gl_tex_parameter(GLenum target, GLenum pname, GLfloat param) override;
@ -152,6 +153,7 @@ private:
GLclampf m_alpha_test_ref_value = 0;
GLenum m_current_read_buffer = GL_BACK;
GLenum m_current_draw_buffer = GL_BACK;
// Client side arrays
bool m_client_side_vertex_array_enabled = false;

2
Userland/Libraries/LibGL/SoftwareRasterizer.cpp
View file

@ -334,7 +334,7 @@ static void rasterize_triangle(const RasterizerOptions& options, Gfx::Bitmap& re
}
// We will not update the color buffer at all
if (!options.color_mask)
if (!options.color_mask || options.draw_buffer == GL_NONE)
continue;
// Draw the pixels according to the previously generated mask

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

@ -44,6 +44,7 @@ struct RasterizerOptions {
GLboolean fog_enabled { false };
GLfloat fog_start { 0.0f };
GLfloat fog_end { 1.0f };
GLenum draw_buffer { GL_BACK };
};
class SoftwareRasterizer final {