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Moved gloffscreen files to gl dir, and the gloffscreen_glx.c. Trimmed gloffscreen_common.c a little. Modified Makefile.target and nv2a.c according to the new gloffscreen files location.

This commit is contained in:
wayo 2013-04-02 22:04:51 -06:00 committed by espes
parent 663ce2b88e
commit e1115b2a7c
4 changed files with 854 additions and 0 deletions
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117
gl/gloffscreen.h Normal file
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/*
* Offscreen OpenGL abstraction layer
*
* Copyright (c) 2010 Intel
* Written by:
* Gordon Williams <gordon.williams@collabora.co.uk>
* Ian Molton <ian.molton@collabora.co.uk>
* Wayo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef GLOFFSCREEN_H_
#define GLOFFSCREEN_H_
#ifdef __APPLE__
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#endif
/* Used to hold data for the OpenGL context */
struct _GloContext;
typedef struct _GloContext GloContext;
/* Format flags for glo_surface_create */
#define GLO_FF_ALPHA_MASK (0x0001)
#define GLO_FF_NOALPHA (0x0000)
#define GLO_FF_ALPHA (0x0001)
#define GLO_FF_BITS_MASK (0x00F0)
#define GLO_FF_BITS_16 (0x0020)
#define GLO_FF_BITS_24 (0x0030)
#define GLO_FF_BITS_32 (0x0040)
#define GLO_FF_DEPTH_MASK (0x0F00)
#define GLO_FF_DEPTH_16 (0x0100)
#define GLO_FF_DEPTH_24 (0x0200)
#define GLO_FF_DEPTH_32 (0x0300)
#define GLO_FF_STENCIL_MASK (0xF000)
#define GLO_FF_STENCIL_8 (0x1000)
/* The only currently supported format */
#define GLO_FF_DEFAULT (GLO_FF_BITS_24|GLO_FF_DEPTH_24)
/* Has gloffscreen been previously initialised? */
extern int glo_initialised(void);
/* Initialise gloffscreen */
extern void glo_init(void);
/* Change current context */
extern void glo_set_current(GloContext *context);
/* Uninitialise gloffscreen */
extern void glo_kill(void);
/* Check GL Extensions */
extern GLboolean glo_check_extension(
const GLubyte *extName, const GLubyte *extString);
/* Create an OpenGL context for a certain
* pixel format. formatflags are from the
* GLO_ constants */
extern GloContext *glo_context_create(int formatFlags);
/* Destroy a previouslu created OpenGL context */
extern void glo_context_destroy(GloContext *context);
/* Functions to decode the format flags */
extern int glo_flags_get_depth_bits(int formatFlags);
extern int glo_flags_get_stencil_bits(int formatFlags);
extern void glo_flags_get_rgba_bits(int formatFlags, int *rgba);
extern int glo_flags_get_bytes_per_pixel(int formatFlags);
extern void glo_flags_get_readpixel_type(int formatFlags, int *glFormat, int *glType);
/* Score how close the given format flags match. 0=great, >0 not so great */
extern int glo_flags_score(int formatFlagsExpected, int formatFlagsReal);
/* Create a set of format flags from a null-terminated list
* of GLX fbConfig flags. If assumeBooleans is set, items such
* as GLX_RGBA/GLX_DOUBLEBUFFER are treated as booleans, not key-value pairs
* (glXChooseVisual treats them as booleans, glXChooseFBConfig as key-value pairs)
*/
extern int glo_flags_get_from_glx(const int *fbConfig, int assumeBooleans);
/* Use in place of glxGetConfig - returns information from flags based on a GLX enum */
extern int glo_get_glx_from_flags(int formatFlags, int glxEnum);
/* In terms of speed, glReadPixels actually seems the best we can do.
* * On Windows PFB_DRAW_TO_BITMAP is software-only.
* * http://www.opengl.org/registry/specs/ARB/pixel_buffer_object.txt would be
* useful if we didn't want the data right away (as we could avoid flushing the
* pipeline).
* * The internal data format seems to be GL_BGRA - and this is indeed faster.
* * Apple suggests using GL_UNSIGNED_INT_8_8_8_8_REV instead of
* GL_UNSIGNED_BYTE, but there don't appear to be any speed increase from
* doing this on Windows at least.
*/
#endif /* GLOFFSCREEN_H_ */

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/*
* Offscreen OpenGL abstraction layer - CGL (Apple) specific
*
* Copyright (c) 2010 Intel
* Written by:
* Wayo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <OpenGL/gl.h>
#include <OpenGL/OpenGL.h>
#include <OpenGL/CGLTypes.h>
#include <OpenGL/CGLCurrent.h>
#include <GLUT/glut.h>
#include "gloffscreen.h"
/* In Windows, you must create a window *before* you can create a pbuffer or
* get a context. So we create a hidden Window on startup(see glo_init/GloMain).
*
* Also, you can't share contexts that have different pixel formats, so we can't
* just create a new context from the window. We must create a whole new PBuffer
* just for a context :(
*/
struct GloMain {
int init;
/* Not needed for CGL? */
};
struct GloMain glo;
int glo_inited = 0;
struct _GloContext {
CGLContextObj cglContext;
};
int glo_initialised(void) {
return glo_inited;
}
/* Initialise gloffscreen */
void glo_init(void) {
/* TODO: CGL Implementation.
* Initialization needed for CGL? */
if (glo_inited) {
printf( "gloffscreen already inited\n" );
exit( EXIT_FAILURE );
}
glo_inited = 1;
}
/* Uninitialise gloffscreen */
void glo_kill(void) {
glo_inited = 0;
}
/* Create an OpenGL context for a certain pixel format. formatflags are from
* the GLO_ constants */
GloContext *glo_context_create(int formatFlags)
{
GloContext *context;
context = (GloContext *)malloc(sizeof(GloContext));
memset(context, 0, sizeof(GloContext));
/* pixel format attributes */
CGLPixelFormatAttribute attributes[] = {
kCGLPFAAccelerated,
(CGLPixelFormatAttribute)0
};
CGLPixelFormatObj pix;
GLint num;
CGLChoosePixelFormat(attributes, &pix, &num);
CGLCreateContext(pix, NULL, &context->cglContext);
CGLDestroyPixelFormat(pix);
if (!glo_inited)
glo_init();
glo_set_current(context);
return context;
}
/* Check if an extension is available. */
GLboolean glo_check_extension(const GLubyte *extName,
const GLubyte *extString)
{
return gluCheckExtension(extName, extString);
}
/* Set current context */
void glo_set_current(GloContext *context)
{
if (context == NULL) {
CGLSetCurrentContext(NULL);
} else {
CGLSetCurrentContext(context->cglContext);
}
}
/* Destroy a previously created OpenGL context */
void glo_context_destroy(GloContext *context)
{
if (!context) return;
glo_set_current(NULL);
CGLDestroyContext(context->cglContext);
}

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/*
* Offscreen OpenGL abstraction layer - Common utilities
*
* Copyright (c) 2010 Intel
* Written by:
* Gordon Williams <gordon.williams@collabora.co.uk>
* Ian Molton <ian.molton@collabora.co.uk>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "gloffscreen.h"
#ifdef _WIN32
#include <windows.h>
#include <GL/gl.h>
#include <GL/glext.h>
#else
#include <GL/gl.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// ---------------------------------------------------
// Copied from glx.h as we need them in windows too
/*
* Tokens for glXChooseVisual and glXGetConfig:
*/
#define GLX_USE_GL 1
#define GLX_BUFFER_SIZE 2
#define GLX_LEVEL 3
#define GLX_RGBA 4
#define GLX_DOUBLEBUFFER 5
#define GLX_STEREO 6
#define GLX_AUX_BUFFERS 7
#define GLX_RED_SIZE 8
#define GLX_GREEN_SIZE 9
#define GLX_BLUE_SIZE 10
#define GLX_ALPHA_SIZE 11
#define GLX_DEPTH_SIZE 12
#define GLX_STENCIL_SIZE 13
#define GLX_ACCUM_RED_SIZE 14
#define GLX_ACCUM_GREEN_SIZE 15
#define GLX_ACCUM_BLUE_SIZE 16
#define GLX_ACCUM_ALPHA_SIZE 17
// ---------------------------------------------------
extern void glo_surface_getcontents_readpixels(int formatFlags, int stride,
int bpp, int width, int height, void *data);
// ---------------------------------------------------
int glo_flags_get_depth_bits(int formatFlags) {
switch ( formatFlags & GLO_FF_DEPTH_MASK ) {
case GLO_FF_DEPTH_16: return 16;
case GLO_FF_DEPTH_24: return 24;
case GLO_FF_DEPTH_32: return 32;
default: return 0;
}
}
int glo_flags_get_stencil_bits(int formatFlags) {
switch ( formatFlags & GLO_FF_STENCIL_MASK ) {
case GLO_FF_STENCIL_8: return 8;
default: return 0;
}
}
void glo_flags_get_rgba_bits(int formatFlags, int *rgba) {
int alpha = (formatFlags & GLO_FF_ALPHA) != 0;
switch ( formatFlags & GLO_FF_BITS_MASK ) {
case GLO_FF_BITS_16:
rgba[0] = alpha ? 4 : 5;
rgba[1] = alpha ? 4 : 6;
rgba[2] = alpha ? 4 : 5;
rgba[3] = alpha ? 4 : 0;
break;
case GLO_FF_BITS_24:
// ignore alpha
rgba[0] = 8;
rgba[1] = 8;
rgba[2] = 8;
rgba[3] = 0;
break;
case GLO_FF_BITS_32:
rgba[0] = 8;
rgba[1] = 8;
rgba[2] = 8;
rgba[3] = 8;
break;
default:
rgba[0] = 8;
rgba[1] = 8;
rgba[2] = 8;
rgba[3] = 0;
break;
}
}
int glo_flags_get_bytes_per_pixel(int formatFlags) {
switch ( formatFlags & GLO_FF_BITS_MASK ) {
case GLO_FF_BITS_16: return 2;
case GLO_FF_BITS_24: return 3;
case GLO_FF_BITS_32: return 4;
default: return 3;
}
}
void glo_flags_get_readpixel_type(int formatFlags, int *glFormat, int *glType) {
GLenum gFormat, gType;
if (formatFlags & GLO_FF_ALPHA) {
switch ( formatFlags & GLO_FF_BITS_MASK ) {
case GLO_FF_BITS_16:
gFormat = GL_RGBA;
gType = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case GLO_FF_BITS_24:
case GLO_FF_BITS_32:
default:
gFormat = GL_BGRA;
gType = GL_UNSIGNED_BYTE;
break;
}
} else {
switch ( formatFlags & GLO_FF_BITS_MASK ) {
case GLO_FF_BITS_16:
gFormat = GL_RGB;
gType = GL_UNSIGNED_SHORT_5_6_5;
break;
case GLO_FF_BITS_24:
case GLO_FF_BITS_32:
default:
gFormat = GL_BGR;
gType = GL_UNSIGNED_BYTE;
break;
}
}
if (glFormat) *glFormat = gFormat;
if (glType) *glType = gType;
}
int glo_flags_score(int formatFlagsExpected, int formatFlagsReal) {
if (formatFlagsExpected == formatFlagsReal) return 0;
int score = 1;
// we wanted alpha, but we didn't get it
if ((formatFlagsExpected&GLO_FF_ALPHA_MASK) <
(formatFlagsReal&GLO_FF_ALPHA_MASK))
score++;
// less bits than we expected
if ((formatFlagsExpected&GLO_FF_BITS_MASK) <
!(formatFlagsReal&GLO_FF_BITS_MASK))
score++;
// less depth bits than we expected
if ((formatFlagsExpected&GLO_FF_DEPTH_MASK) <
!(formatFlagsReal&GLO_FF_DEPTH_MASK))
score++;
// less stencil bits than we expected
if ((formatFlagsExpected&GLO_FF_STENCIL_MASK) <
!(formatFlagsReal&GLO_FF_STENCIL_MASK))
score++;
return score;
}
int glo_flags_get_from_glx(const int *fbConfig, int assumeBooleans) {
int bufferSize = 0;
int depthSize = 0;
int stencilSize = 0;
int rgbaSize[] = {0,0,0,0};
int flags = 0;
while (*fbConfig) {
int isSingle = 0;
switch (*fbConfig) {
case GLX_USE_GL:
isSingle = 1;
break;
case GLX_BUFFER_SIZE:
bufferSize = fbConfig[1];
break;
case GLX_LEVEL:
break;
case GLX_RGBA:
flags |= GLO_FF_ALPHA;
break;
case GLX_DOUBLEBUFFER:
isSingle = 1;
break;
case GLX_STEREO:
isSingle = 1;
break;
case GLX_AUX_BUFFERS:
break;
case GLX_RED_SIZE:
rgbaSize[0] = fbConfig[1];
break;
case GLX_GREEN_SIZE:
rgbaSize[1] = fbConfig[1];
break;
case GLX_BLUE_SIZE:
rgbaSize[2] = fbConfig[1];
break;
case GLX_ALPHA_SIZE:
rgbaSize[3] = fbConfig[1];
break;
case GLX_DEPTH_SIZE:
depthSize = fbConfig[1];
break;
case GLX_STENCIL_SIZE:
stencilSize = fbConfig[1];
break;
case GLX_ACCUM_RED_SIZE:
case GLX_ACCUM_GREEN_SIZE:
case GLX_ACCUM_BLUE_SIZE:
case GLX_ACCUM_ALPHA_SIZE:
break;
}
// go to next
if (isSingle && assumeBooleans)
fbConfig++;
else
fbConfig+=2;
}
if (rgbaSize[3])
flags |= GLO_FF_ALPHA;
// ensure we have room for *some* alpha
if ((flags & GLO_FF_ALPHA) && (rgbaSize[3]==0))
rgbaSize[3] = 1;
// Buffer size flag
if (bufferSize==0)
bufferSize = rgbaSize[0]+rgbaSize[1]+rgbaSize[2]+rgbaSize[3];
if (bufferSize==0)
bufferSize = (flags & GLO_FF_ALPHA) ? 32 : 24;
if (bufferSize<=16)
flags |= GLO_FF_BITS_16;
else if (bufferSize<=24)
flags |= GLO_FF_BITS_24;
else flags |= GLO_FF_BITS_32;
// Depth
if (depthSize<=16)
flags |= GLO_FF_DEPTH_16;
else if (depthSize<=24)
flags |= GLO_FF_DEPTH_24;
else flags |= GLO_FF_DEPTH_32;
// Stencil
if (stencilSize>0)
flags |= GLO_FF_STENCIL_8;
return flags;
}
int glo_get_glx_from_flags(int formatFlags, int glxEnum) {
int rgba[4];
glo_flags_get_rgba_bits(formatFlags, rgba);
switch (glxEnum) {
case GLX_USE_GL: return 1;
case GLX_BUFFER_SIZE: return glo_flags_get_bytes_per_pixel(formatFlags)*8;
case GLX_LEVEL: return 0;
case GLX_RGBA: return formatFlags & GLO_FF_ALPHA;
case GLX_DOUBLEBUFFER: return 1;
case GLX_STEREO: return 0;
case GLX_AUX_BUFFERS: return 0;
case GLX_RED_SIZE: return rgba[0];
case GLX_GREEN_SIZE: return rgba[1];
case GLX_BLUE_SIZE: return rgba[2];
case GLX_ALPHA_SIZE: return rgba[3];
case GLX_DEPTH_SIZE: return glo_flags_get_depth_bits(formatFlags);
case GLX_STENCIL_SIZE: return glo_flags_get_stencil_bits(formatFlags);
case GLX_ACCUM_RED_SIZE:
case GLX_ACCUM_GREEN_SIZE:
case GLX_ACCUM_BLUE_SIZE:
case GLX_ACCUM_ALPHA_SIZE:
return 0;
}
return 0;
}

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/*
* Offscreen OpenGL abstraction layer - WGL (windows) specific
*
* Copyright (c) 2010 Intel
* Written by:
* Gordon Williams <gordon.williams@collabora.co.uk>
* Ian Molton <ian.molton@collabora.co.uk>
* Wayo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <wingdi.h>
#include <GL/glew.h>
#include <GL/gl.h>
#include <GL/glext.h>
#include <GL/wglext.h>
#include <GL/glut.h>
#include "gloffscreen.h"
/* In Windows, you must create a window *before* you can create a pbuffer or
* get a context. So we create a hidden Window on startup(see glo_init/GloMain).
*
* Also, you can't share contexts that have different pixel formats, so we can't
* just create a new context from the window. We must create a whole new PBuffer
* just for a context :(
*/
struct GloMain {
HINSTANCE hInstance;
HDC hDC;
HWND hWnd; /* Our hidden window */
HGLRC hContext;
};
struct GloMain glo;
int glo_inited = 0;
struct _GloContext {
int formatFlags;
/* Pixel format returned by wglChoosePixelFormat */
int wglPixelFormat;
/* We need a pbuffer to make a context of the right pixelformat :( */
HPBUFFERARB hPBuffer;
HDC hDC;
HGLRC hContext;
};
#define GLO_WINDOW_CLASS "QEmuGLClass"
#define DEFAULT_DEPTH_BUFFER (16)
PFNWGLCHOOSEPIXELFORMATARBPROC wglChoosePixelFormatARB;
PFNWGLGETPBUFFERDCARBPROC wglGetPbufferDCARB;
PFNWGLRELEASEPBUFFERDCARBPROC wglReleasePbufferDCARB;
PFNWGLCREATEPBUFFERARBPROC wglCreatePbufferARB;
PFNWGLDESTROYPBUFFERARBPROC wglDestroyPbufferARB;
int glo_initialised(void) {
return glo_inited;
}
/* Initialise gloffscreen */
void glo_init(void) {
WNDCLASSEX wcx;
PIXELFORMATDESCRIPTOR pfd;
if (glo_inited) {
printf("gloffscreen already inited\n");
exit(EXIT_FAILURE);
}
/* Grab An Instance For Our Window */
glo.hInstance = GetModuleHandle(NULL);
wcx.cbSize = sizeof(wcx);
wcx.style = 0;
wcx.lpfnWndProc = DefWindowProc;
wcx.cbClsExtra = 0;
wcx.cbWndExtra = 0;
wcx.hInstance = glo.hInstance;
wcx.hIcon = NULL;
wcx.hCursor = NULL;
wcx.hbrBackground = NULL;
wcx.lpszMenuName = NULL;
wcx.lpszClassName = GLO_WINDOW_CLASS;
wcx.hIconSm = NULL;
RegisterClassEx(&wcx);
glo.hWnd = CreateWindow(
GLO_WINDOW_CLASS,
"QEmuGL",
0,0,0,0,0,
(HWND)NULL, (HMENU)NULL,
glo.hInstance,
(LPVOID) NULL);
if (!glo.hWnd) {
printf("Unable to create window\n");
exit(EXIT_FAILURE);
}
glo.hDC = GetDC(glo.hWnd);
memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.iLayerType = PFD_MAIN_PLANE;
unsigned int pixelFormat = ChoosePixelFormat(glo.hDC, &pfd);
DescribePixelFormat(glo.hDC,
pixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);
if (!SetPixelFormat(glo.hDC, pixelFormat, &pfd))
return;
glo.hContext = wglCreateContext(glo.hDC);
if (glo.hContext == NULL) {
printf("Unable to create GL context\n");
exit(EXIT_FAILURE);
}
wglMakeCurrent(glo.hDC, glo.hContext);
wglChoosePixelFormatARB = (PFNWGLCHOOSEPIXELFORMATARBPROC)
wglGetProcAddress("wglChoosePixelFormatARB");
wglGetPbufferDCARB = (PFNWGLGETPBUFFERDCARBPROC)
wglGetProcAddress("wglGetPbufferDCARB");
wglReleasePbufferDCARB = (PFNWGLRELEASEPBUFFERDCARBPROC)
wglGetProcAddress("wglReleasePbufferDCARB");
wglCreatePbufferARB = (PFNWGLCREATEPBUFFERARBPROC)
wglGetProcAddress("wglCreatePbufferARB");
wglDestroyPbufferARB = (PFNWGLDESTROYPBUFFERARBPROC)
wglGetProcAddress("wglDestroyPbufferARB");
if (!wglChoosePixelFormatARB ||
!wglGetPbufferDCARB ||
!wglReleasePbufferDCARB ||
!wglCreatePbufferARB ||
!wglDestroyPbufferARB) {
printf("Unable to load the required WGL extensions\n");
exit(EXIT_FAILURE);
}
/* Initialize glew */
if (GLEW_OK != glewInit()) {
/* GLEW failed! */
printf("Glew init failed.");
exit(1);
}
glo_inited = 1;
}
/* Uninitialise gloffscreen */
void glo_kill(void) {
if (glo.hContext) {
wglMakeCurrent(NULL, NULL);
wglDeleteContext(glo.hContext);
glo.hContext = NULL;
}
if (glo.hDC) {
ReleaseDC(glo.hWnd, glo.hDC);
glo.hDC = NULL;
}
if (glo.hWnd) {
DestroyWindow(glo.hWnd);
glo.hWnd = NULL;
}
UnregisterClass(GLO_WINDOW_CLASS, glo.hInstance);
}
/* Create an OpenGL context for a certain pixel format. formatflags are from
* the GLO_ constants */
GloContext *glo_context_create(int formatFlags) {
GloContext *context;
/* pixel format attributes */
int pf_attri[] = {
WGL_SUPPORT_OPENGL_ARB, TRUE,
WGL_DRAW_TO_PBUFFER_ARB, TRUE,
WGL_RED_BITS_ARB, 8,
WGL_GREEN_BITS_ARB, 8,
WGL_BLUE_BITS_ARB, 8,
WGL_ALPHA_BITS_ARB, 8,
WGL_DEPTH_BITS_ARB, 0,
WGL_STENCIL_BITS_ARB, 0,
WGL_DOUBLE_BUFFER_ARB, FALSE,
0
};
float pf_attrf[] = {0, 0};
unsigned int numReturned = 0;
int pb_attr[] = { 0 };
int rgbaBits[4];
if (!glo_inited)
glo_init();
context = (GloContext *)malloc(sizeof(GloContext));
memset(context, 0, sizeof(GloContext));
context->formatFlags = formatFlags;
/* set up the surface format from the flags we were given */
glo_flags_get_rgba_bits(context->formatFlags, rgbaBits);
pf_attri[5] = rgbaBits[0];
pf_attri[7] = rgbaBits[1];
pf_attri[9] = rgbaBits[2];
pf_attri[11] = rgbaBits[3];
pf_attri[13] = glo_flags_get_depth_bits(context->formatFlags);
pf_attri[15] = glo_flags_get_stencil_bits(context->formatFlags);
/* find out what pixel format to use */
wglChoosePixelFormatARB(glo.hDC, pf_attri, pf_attrf, 1,
&context->wglPixelFormat, &numReturned);
if (numReturned == 0) {
printf( "No matching configs found.\n" );
exit(EXIT_FAILURE);
}
/* We create a tiny pbuffer - just so we can make a context of
* the right pixel format */
context->hPBuffer = wglCreatePbufferARB(glo.hDC, context->wglPixelFormat,
16, 16, pb_attr);
if (!context->hPBuffer) {
printf("Couldn't create the PBuffer\n");
exit(EXIT_FAILURE);
}
context->hDC = wglGetPbufferDCARB(context->hPBuffer);
if (!context->hDC) {
printf("Couldn't create the DC\n");
exit(EXIT_FAILURE);
}
context->hContext = wglCreateContext(context->hDC);
if (context->hContext == NULL) {
printf("Unable to create GL context\n");
exit(EXIT_FAILURE);
}
glo_set_current(context);
return context;
}
/* Set current context */
void glo_set_current(GloContext *context) {
if (context == NULL) {
wglMakeCurrent(NULL, NULL);
} else {
wglMakeCurrent(context->hDC, context->hContext);
}
}
/* Destroy a previously created OpenGL context */
void glo_context_destroy(GloContext *context)
{
if (!context) return;
wglMakeCurrent(NULL, NULL);
if (context->hPBuffer != NULL) {
wglReleasePbufferDCARB(context->hPBuffer, context->hDC);
wglDestroyPbufferARB(context->hPBuffer);
}
if (context->hDC != NULL) {
ReleaseDC(glo.hWnd, context->hDC);
}
if (context->hContext) {
wglDeleteContext(context->hContext);
}
free(context);
}
/* Check extension implementation for Windows.
* The Glu 1.2 framework in Windows doesn't include them... */
GLboolean glo_check_extension(const GLubyte *extName,
const GLubyte *extString)
{
char *p = (char *) glGetString(GL_EXTENSIONS);
char *end;
if (p == NULL) {
return GL_FALSE;
}
end = p + strlen(p);
while (p < end) {
int n = strcspn(p, " ");
if ((strlen(extName) == n) && (strncmp(extName, p, n) == 0)) {
return GL_TRUE;
}
p += (n + 1);
}
return GL_FALSE;
}