RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 20:17:44 +00:00
Code Issues Activity Actions

LibGL: Implement a basic OpenGL 1.x compatible library

Browse source 
This currently (obviously) doesn't support any actual 3D hardware,
hence all calls are done via software rendering.

Note that any modern constructs such as shaders are unsupported,
as this driver only implements Fixed Function Pipeline functionality.

The library is split into a base GLContext interface and a software
based renderer implementation of said interface. The global glXXX
functions serve as an OpenGL compatible c-style interface to the
currently bound context instance.

Co-authored-by: Stephan Unverwerth <s.unverwerth@gmx.de>
This commit is contained in:
Jesse Buhagiar 2021-01-06 22:58:01 +11:00 • committed by Andreas Kling
parent 1424c4651f
commit 4807d32139
14 changed files with 920 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

56
Userland/Libraries/LibGL/GLMat.cpp Normal file
View file

@ -0,0 +1,56 @@
/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "GL/gl.h"
#include "GLContext.h"
extern GL::GLContext* g_gl_context;
void glMatrixMode(GLenum mode)
{
g_gl_context->gl_matrix_mode(mode);
}
/*
* Push the current matrix (based on the current matrix mode)
* to its' corresponding matrix stack in the current OpenGL
* state context
*/
void glPushMatrix()
{
g_gl_context->gl_push_matrix();
}
/*
* Pop a matrix from the corresponding matrix stack into the
* corresponding matrix in the state based on the current
* matrix mode
*/
void glPopMatrix()
{
g_gl_context->gl_pop_matrix();
}
void glLoadIdentity()
{
g_gl_context->gl_load_identity();
}
/**
* Create a viewing frustum (a.k.a a "Perspective Matrix") in the current matrix. This
* is usually done to the projection matrix. The current matrix is then multiplied
* by this viewing frustum matrix.
*
* https://www.khronos.org/registry/OpenGL-Refpages/gl2.1/xhtml/glFrustum.xml
*
*
* FIXME: We need to check for some values that could result in a division by zero
*/
void glFrustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble nearVal, GLdouble farVal)
{
g_gl_context->gl_frustum(left, right, bottom, top, nearVal, farVal);
}