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SDL_cgxgl.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* StormMesa implementation of SDL OpenGL support */
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#include "SDL_cgxgl_c.h"
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#include "SDL_cgxvideo.h"
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#if SDL_VIDEO_OPENGL
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AmigaMesaContext glcont = NULL;
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/* Init OpenGL */
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int
CGX_GL_Init (_THIS)
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#if SDL_VIDEO_OPENGL
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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);
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#else
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SDL_SetError ("OpenGL support not configured");
return (-1);
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#endif
}
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/* Quit OpenGL */
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void
CGX_GL_Quit (_THIS)
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{
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#if SDL_VIDEO_OPENGL
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if (glcont != NULL) {
AmigaMesaDestroyContext (glcont);
glcont = NULL;
this->gl_data->gl_active = 0;
this->gl_config.driver_loaded = 0;
}
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#endif
}
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/* Attach context to another window */
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int
CGX_GL_Update (_THIS)
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{
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#if SDL_VIDEO_OPENGL
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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;
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#else
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SDL_SetError ("OpenGL support not configured");
return -1;
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#endif
}
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#if SDL_VIDEO_OPENGL
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/* Make the current context active */
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int
CGX_GL_MakeCurrent (_THIS)
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{
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if (glcont == NULL)
return -1;
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AmigaMesaMakeCurrent (glcont, glcont->buffer);
return 0;
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}
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void
CGX_GL_SwapBuffers (_THIS)
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{
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AmigaMesaSwapBuffers (glcont);
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}
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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;
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}
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void *
CGX_GL_GetProcAddress (_THIS, const char *proc)
{
void *func = NULL;
func = AmiGetGLProc (proc);
return func;
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}
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int
CGX_GL_LoadLibrary (_THIS, const char *path)
{
/* Library is always open */
this->gl_config.driver_loaded = 1;
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}
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#endif /* SDL_VIDEO_OPENGL */
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/* vi: set ts=4 sw=4 expandtab: */