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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
/* StormMesa implementation of SDL OpenGL support */
#include "SDL_cgxgl_c.h"
#include "SDL_cgxvideo.h"
#ifdef HAVE_OPENGL
AmigaMesaContext glcont=NULL;
#endif
/* Init OpenGL */
int CGX_GL_Init(_THIS)
{
#ifdef HAVE_OPENGL
int i = 0;
struct TagItem attributes [ 14 ]; /* 14 should be more than enough :) */
struct Window *win = (struct Window *)SDL_Window;
// default config. Always used...
attributes[i].ti_Tag = AMA_Window; attributes[i++].ti_Data = (unsigned long)win;
attributes[i].ti_Tag = AMA_Left; attributes[i++].ti_Data = 0;
attributes[i].ti_Tag = AMA_Bottom; attributes[i++].ti_Data = 0;
attributes[i].ti_Tag = AMA_Width; attributes[i++].ti_Data = win->Width-win->BorderLeft-win->BorderRight;
attributes[i].ti_Tag = AMA_Height; attributes[i++].ti_Data = win->Height-win->BorderBottom-win->BorderTop;
attributes[i].ti_Tag = AMA_DirectRender; attributes[i++].ti_Data = GL_TRUE;
// double buffer ?
attributes[i].ti_Tag = AMA_DoubleBuf;
if ( this->gl_config.double_buffer ) {
attributes[i++].ti_Data = GL_TRUE;
}
else {
attributes[i++].ti_Data = GL_FALSE;
}
// RGB(A) Mode ?
attributes[i].ti_Tag = AMA_RGBMode;
if ( this->gl_config.red_size != 0 &&
this->gl_config.blue_size != 0 &&
this->gl_config.green_size != 0 ) {
attributes[i++].ti_Data = GL_TRUE;
}
else {
attributes[i++].ti_Data = GL_FALSE;
}
// no depth buffer ?
if ( this->gl_config.depth_size == 0 ) {
attributes[i].ti_Tag = AMA_NoDepth;
attributes[i++].ti_Data = GL_TRUE;
}
// no stencil buffer ?
if ( this->gl_config.stencil_size == 0 ) {
attributes[i].ti_Tag = AMA_NoStencil;
attributes[i++].ti_Data = GL_TRUE;
}
// no accum buffer ?
if ( this->gl_config.accum_red_size != 0 &&
this->gl_config.accum_blue_size != 0 &&
this->gl_config.accum_green_size != 0 ) {
attributes[i].ti_Tag = AMA_NoAccum;
attributes[i++].ti_Data = GL_TRUE;
}
// done...
attributes[i].ti_Tag = TAG_DONE;
glcont = AmigaMesaCreateContext(attributes);
if ( glcont == NULL ) {
SDL_SetError("Couldn't create OpenGL context");
return(-1);
}
this->gl_data->gl_active = 1;
this->gl_config.driver_loaded = 1;
return(0);
#else
SDL_SetError("OpenGL support not configured");
return(-1);
#endif
}
/* Quit OpenGL */
void CGX_GL_Quit(_THIS)
{
#ifdef HAVE_OPENGL
if ( glcont != NULL ) {
AmigaMesaDestroyContext(glcont);
glcont = NULL;
this->gl_data->gl_active = 0;
this->gl_config.driver_loaded = 0;
}
#endif
}
/* Attach context to another window */
int CGX_GL_Update(_THIS)
{
#ifdef HAVE_OPENGL
struct TagItem tags[2];
struct Window *win = (struct Window*)SDL_Window;
if(glcont == NULL) {
return -1; //should never happen
}
tags[0].ti_Tag = AMA_Window;
tags[0].ti_Data = (unsigned long)win;
tags[1].ti_Tag = TAG_DONE;
AmigaMesaSetRast(glcont, tags);
return 0;
#else
SDL_SetError("OpenGL support not configured");
return -1;
#endif
}
#ifdef HAVE_OPENGL
/* Make the current context active */
int CGX_GL_MakeCurrent(_THIS)
{
if(glcont == NULL)
return -1;
AmigaMesaMakeCurrent(glcont, glcont->buffer);
return 0;
}
void CGX_GL_SwapBuffers(_THIS)
{
AmigaMesaSwapBuffers(glcont);
}
int CGX_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) {
GLenum mesa_attrib;
switch(attrib) {
case SDL_GL_RED_SIZE:
mesa_attrib = GL_RED_BITS;
break;
case SDL_GL_GREEN_SIZE:
mesa_attrib = GL_GREEN_BITS;
break;
case SDL_GL_BLUE_SIZE:
mesa_attrib = GL_BLUE_BITS;
break;
case SDL_GL_ALPHA_SIZE:
mesa_attrib = GL_ALPHA_BITS;
break;
case SDL_GL_DOUBLEBUFFER:
mesa_attrib = GL_DOUBLEBUFFER;
break;
case SDL_GL_DEPTH_SIZE:
mesa_attrib = GL_DEPTH_BITS;
break;
case SDL_GL_STENCIL_SIZE:
mesa_attrib = GL_STENCIL_BITS;
break;
case SDL_GL_ACCUM_RED_SIZE:
mesa_attrib = GL_ACCUM_RED_BITS;
break;
case SDL_GL_ACCUM_GREEN_SIZE:
mesa_attrib = GL_ACCUM_GREEN_BITS;
break;
case SDL_GL_ACCUM_BLUE_SIZE:
mesa_attrib = GL_ACCUM_BLUE_BITS;
break;
case SDL_GL_ACCUM_ALPHA_SIZE:
mesa_attrib = GL_ACCUM_ALPHA_BITS;
break;
default :
return -1;
}
AmigaMesaGetConfig(glcont->visual, mesa_attrib, value);
return 0;
}
void *CGX_GL_GetProcAddress(_THIS, const char *proc) {
void *func = NULL;
func = AmiGetGLProc(proc);
return func;
}
int CGX_GL_LoadLibrary(_THIS, const char *path) {
/* Library is always open */
this->gl_config.driver_loaded = 1;
return 0;
}
#endif /* HAVE_OPENGL */
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