/*

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"

#if SDL_VIDEO_OPENGL

AmigaMesaContext glcont=NULL;

#endif

/* Init OpenGL */

int CGX_GL_Init(_THIS)

{

#if SDL_VIDEO_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)

{

#if SDL_VIDEO_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)

{

#if SDL_VIDEO_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

}

#if SDL_VIDEO_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 /* SDL_VIDEO_OPENGL */