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LibGL: Implement a basic OpenGL 1.x compatible library

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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
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81
Userland/Libraries/LibGL/GL/gl.h Normal file
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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#ifndef GLAPI
# define GLAPI extern
#endif
// OpenGL related `defines`
#define GL_TRUE 1
#define GL_FALSE 0
// Matrix Modes
#define GL_MODELVIEW 0x0050
#define GL_PROJECTION 0x0051
// glBegin/glEnd primitive types
#define GL_TRIANGLES 0x0100
#define GL_QUADS 0x0101
#define GL_TRIANGLE_FAN 0x0102
#define GL_TRIANGLE_STRIP 0x0103
#define GL_POLYGON 0x0104
// Buffer bits
#define GL_COLOR_BUFFER_BIT 0x0200
// Utility
#define GL_VENDOR 0x1F00
#define GL_RENDERER 0x1F01
#define GL_VERSION 0x1F02
//
// OpenGL typedefs
//
// Defines types used by all OpenGL applications
// https://www.khronos.org/opengl/wiki/OpenGL_Type
typedef char GLchar;
typedef unsigned char GLuchar;
typedef unsigned char GLubyte;
typedef short GLshort;
typedef unsigned short GLushort;
typedef int GLint;
typedef unsigned int GLuint;
typedef int GLfixed;
typedef long long GLint64;
typedef unsigned long long GLuint64;
typedef unsigned long GLsizei;
typedef void GLvoid;
typedef float GLfloat;
typedef float GLclampf;
typedef double GLdouble;
typedef unsigned int GLenum;
typedef unsigned int GLbitfield;
GLAPI void glBegin(GLenum mode);
GLAPI void glClear(GLbitfield mask);
GLAPI void glClearColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
GLAPI void glColor3f(GLfloat r, GLfloat g, GLfloat b);
GLAPI void glEnd();
GLAPI void glFrustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble nearVal, GLdouble farVal);
GLAPI GLubyte* glGetString(GLenum name);
GLAPI void glLoadIdentity();
GLAPI void glMatrixMode(GLenum mode);
GLAPI void glPushMatrix();
GLAPI void glPopMatrix();
GLAPI void glRotatef(GLfloat angle, GLfloat x, GLfloat y, GLfloat z);
GLAPI void glTranslatef(GLfloat x, GLfloat y, GLfloat z);
GLAPI void glVertex3f(GLfloat x, GLfloat y, GLfloat z);
GLAPI void glViewport(GLint x, GLint y, GLsizei width, GLsizei height);
#ifdef __cplusplus
}
#endif