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#include <stdlib.h>
#include <string.h>
#include "SDL.h"
#include "oglfunc.h"
PFNGLALPHAFUNCPROC pglAlphaFunc;
PFNGLARRAYELEMENTPROC pglArrayElement;
PFNGLBEGINPROC pglBegin;
PFNGLBINDTEXTUREPROC pglBindTexture;
PFNGLBLENDFUNCPROC pglBlendFunc;
PFNGLCLEARPROC pglClear;
PFNGLCLEARCOLORPROC pglClearColor;
PFNGLCOLOR3FPROC pglColor3f;
PFNGLCOLOR3FVPROC pglColor3fv;
PFNGLCOLOR3UBPROC pglColor3ub;
PFNGLCOLOR3UBVPROC pglColor3ubv;
PFNGLCOLOR4FPROC pglColor4f;
PFNGLCOLOR4FVPROC pglColor4fv;
PFNGLCOLOR4UBPROC pglColor4ub;
PFNGLCOLOR4UBVPROC pglColor4ubv;
PFNGLCOLORPOINTERPROC pglColorPointer;
PFNGLCULLFACEPROC pglCullFace;
PFNGLDELETETEXTURESPROC pglDeleteTextures;
PFNGLDEPTHFUNCPROC pglDepthFunc;
PFNGLDEPTHMASKPROC pglDepthMask;
PFNGLDEPTHRANGEPROC pglDepthRange;
PFNGLDISABLEPROC pglDisable;
PFNGLDISABLECLIENTSTATEPROC pglDisableClientState;
PFNGLDRAWBUFFERPROC pglDrawBuffer;
PFNGLDRAWELEMENTSPROC pglDrawElements;
PFNGLDRAWPIXELSPROC pglDrawPixels;
PFNGLDRAWRANGEELEMENTSPROC pglDrawRangeElements;
PFNGLENABLEPROC pglEnable;
PFNGLENABLECLIENTSTATEPROC pglEnableClientState;
PFNGLENDPROC pglEnd;
PFNGLFRONTFACEPROC pglFrontFace;
PFNGLFRUSTUMPROC pglFrustum;
PFNGLGENTEXTURESPROC pglGenTextures;
PFNGLGETERRORPROC pglGetError;
PFNGLGETFLOATVPROC pglGetFloatv;
PFNGLGETINTEGERVPROC pglGetIntegerv;
PFNGLGETSTRINGPROC pglGetString;
PFNGLHINTPROC pglHint;
PFNGLLOADIDENTITYPROC pglLoadIdentity;
PFNGLLOADMATRIXFPROC pglLoadMatrixf;
PFNGLMATRIXMODEPROC pglMatrixMode;
PFNGLMULTMATRIXFPROC pglMultMatrixf;
PFNGLNORMALPOINTERPROC pglNormalPointer;
PFNGLORTHOPROC pglOrtho;
PFNGLPIXELSTOREIPROC pglPixelStorei;
PFNGLPIXELZOOMPROC pglPixelZoom;
PFNGLPOLYGONMODEPROC pglPolygonMode;
PFNGLPOLYGONOFFSETPROC pglPolygonOffset;
PFNGLPOPATTRIBPROC pglPopAttrib;
PFNGLPOPCLIENTATTRIBPROC pglPopClientAttrib;
PFNGLPOPMATRIXPROC pglPopMatrix;
PFNGLPUSHATTRIBPROC pglPushAttrib;
PFNGLPUSHCLIENTATTRIBPROC pglPushClientAttrib;
PFNGLPUSHMATRIXPROC pglPushMatrix;
PFNGLRASTERPOS2IPROC pglRasterPos2i;
PFNGLREADBUFFERPROC pglReadBuffer;
PFNGLREADPIXELSPROC pglReadPixels;
PFNGLROTATEFPROC pglRotatef;
PFNGLSCALEFPROC pglScalef;
PFNGLSHADEMODELPROC pglShadeModel;
PFNGLTEXCOORD2FPROC pglTexCoord2f;
PFNGLTEXCOORD2FVPROC pglTexCoord2fv;
PFNGLTEXCOORD3FPROC pglTexCoord3f;
PFNGLTEXCOORD3FVPROC pglTexCoord3fv;
PFNGLTEXCOORD4FPROC pglTexCoord4f;
PFNGLTEXCOORD4FVPROC pglTexCoord4fv;
PFNGLTEXCOORDPOINTERPROC pglTexCoordPointer;
PFNGLTEXENVFPROC pglTexEnvf;
PFNGLTEXENVFVPROC pglTexEnvfv;
PFNGLTEXENVIPROC pglTexEnvi;
PFNGLTEXIMAGE2DPROC pglTexImage2D;
PFNGLTEXPARAMETERFPROC pglTexParameterf;
PFNGLTEXPARAMETERIPROC pglTexParameteri;
PFNGLTEXSUBIMAGE2DPROC pglTexSubImage2D;
PFNGLTRANSLATEFPROC pglTranslatef;
PFNGLVERTEX2FPROC pglVertex2f;
PFNGLVERTEX2FVPROC pglVertex2fv;
PFNGLVERTEX3FPROC pglVertex3f;
PFNGLVERTEX3FVPROC pglVertex3fv;
PFNGLVERTEX4FPROC pglVertex4f;
PFNGLVERTEX4FVPROC pglVertex4fv;
PFNGLVERTEXPOINTERPROC pglVertexPointer;
PFNGLVIEWPORTPROC pglViewport;
// GL_EXT_paletted_texture
PFNGLCOLORTABLEEXTPROC pglColorTableEXT;
PFNGLGETCOLORTABLEPARAMETERIVEXTPROC pglGetColorTableParameterivEXT;
// GL_EXT_secondary_color
PFNGLSECONDARYCOLOR3FEXTPROC pglSecondaryColor3fEXT;
PFNGLSECONDARYCOLOR3FVEXTPROC pglSecondaryColor3fvEXT;
PFNGLSECONDARYCOLOR3UBEXTPROC pglSecondaryColor3ubEXT;
PFNGLSECONDARYCOLOR3UBVEXTPROC pglSecondaryColor3ubvEXT;
PFNGLSECONDARYCOLORPOINTEREXTPROC pglSecondaryColorPointerEXT;
int ogl_have_paletted_texture;
int ogl_have_secondary_color;
int ogl_use_paletted_texture;
int ogl_use_secondary_color;
static void dummyfunc()
{
}
#define LoadOGLProc(type, func) \
{ \
if (!mode) p##func = (type) dummyfunc; else \
p##func = (type) SDL_GL_GetProcAddress(#func); \
if (p##func == NULL) { \
if (!ogl_missing_func) ogl_missing_func = #func; \
} \
}
static int check_token(const char *string, const char *token)
{
const char *s = string;
int len = strlen(token);
while ((s = strstr(s, token)) != NULL) {
const char *next = s + len;
if ((s == string || *(s-1) == ' ') &&
(*next == 0 || *next == ' ')) {
return 1;
}
s = next;
}
return 0;
}
void load_ogl_functions(int mode)
{
const char * ogl_missing_func;
ogl_missing_func = NULL;
LoadOGLProc(PFNGLALPHAFUNCPROC, glAlphaFunc);
LoadOGLProc(PFNGLARRAYELEMENTPROC, glArrayElement);
LoadOGLProc(PFNGLBEGINPROC, glBegin);
LoadOGLProc(PFNGLBINDTEXTUREPROC, glBindTexture);
LoadOGLProc(PFNGLBLENDFUNCPROC, glBlendFunc);
LoadOGLProc(PFNGLCLEARPROC, glClear);
LoadOGLProc(PFNGLCLEARCOLORPROC, glClearColor);
LoadOGLProc(PFNGLCOLOR3FPROC, glColor3f);
LoadOGLProc(PFNGLCOLOR3FVPROC, glColor3fv);
LoadOGLProc(PFNGLCOLOR3UBPROC, glColor3ub);
LoadOGLProc(PFNGLCOLOR3UBVPROC, glColor3ubv);
LoadOGLProc(PFNGLCOLOR4FPROC, glColor4f);
LoadOGLProc(PFNGLCOLOR4FVPROC, glColor4fv);
LoadOGLProc(PFNGLCOLOR4UBPROC, glColor4ub);
LoadOGLProc(PFNGLCOLOR4UBVPROC, glColor4ubv);
LoadOGLProc(PFNGLCOLORPOINTERPROC, glColorPointer);
LoadOGLProc(PFNGLCULLFACEPROC, glCullFace);
LoadOGLProc(PFNGLDELETETEXTURESPROC, glDeleteTextures);
LoadOGLProc(PFNGLDEPTHFUNCPROC, glDepthFunc);
LoadOGLProc(PFNGLDEPTHMASKPROC, glDepthMask);
LoadOGLProc(PFNGLDEPTHRANGEPROC, glDepthRange);
LoadOGLProc(PFNGLDISABLEPROC, glDisable);
LoadOGLProc(PFNGLDISABLECLIENTSTATEPROC, glDisableClientState);
LoadOGLProc(PFNGLDRAWBUFFERPROC, glDrawBuffer);
LoadOGLProc(PFNGLDRAWELEMENTSPROC, glDrawElements);
LoadOGLProc(PFNGLDRAWPIXELSPROC, glDrawPixels);
LoadOGLProc(PFNGLDRAWRANGEELEMENTSPROC, glDrawRangeElements);
LoadOGLProc(PFNGLENABLEPROC, glEnable);
LoadOGLProc(PFNGLENABLECLIENTSTATEPROC, glEnableClientState);
LoadOGLProc(PFNGLENDPROC, glEnd);
LoadOGLProc(PFNGLFRONTFACEPROC, glFrontFace);
LoadOGLProc(PFNGLFRUSTUMPROC, glFrustum);
LoadOGLProc(PFNGLGENTEXTURESPROC, glGenTextures);
LoadOGLProc(PFNGLGETERRORPROC, glGetError);
LoadOGLProc(PFNGLGETFLOATVPROC, glGetFloatv);
LoadOGLProc(PFNGLGETINTEGERVPROC, glGetIntegerv);
LoadOGLProc(PFNGLGETSTRINGPROC, glGetString);
LoadOGLProc(PFNGLHINTPROC, glHint);
LoadOGLProc(PFNGLLOADIDENTITYPROC, glLoadIdentity);
LoadOGLProc(PFNGLLOADMATRIXFPROC, glLoadMatrixf);
LoadOGLProc(PFNGLMATRIXMODEPROC, glMatrixMode);
LoadOGLProc(PFNGLMULTMATRIXFPROC, glMultMatrixf);
LoadOGLProc(PFNGLNORMALPOINTERPROC, glNormalPointer);
LoadOGLProc(PFNGLORTHOPROC, glOrtho);
LoadOGLProc(PFNGLPIXELSTOREIPROC, glPixelStorei);
LoadOGLProc(PFNGLPIXELZOOMPROC, glPixelZoom);
LoadOGLProc(PFNGLPOLYGONMODEPROC, glPolygonMode);
LoadOGLProc(PFNGLPOLYGONOFFSETPROC, glPolygonOffset);
LoadOGLProc(PFNGLPOPATTRIBPROC, glPopAttrib);
LoadOGLProc(PFNGLPOPCLIENTATTRIBPROC, glPopClientAttrib);
LoadOGLProc(PFNGLPOPMATRIXPROC, glPopMatrix);
LoadOGLProc(PFNGLPUSHATTRIBPROC, glPushAttrib);
LoadOGLProc(PFNGLPUSHCLIENTATTRIBPROC, glPushClientAttrib);
LoadOGLProc(PFNGLPUSHMATRIXPROC, glPushMatrix);
LoadOGLProc(PFNGLRASTERPOS2IPROC, glRasterPos2i);
LoadOGLProc(PFNGLREADBUFFERPROC, glReadBuffer);
LoadOGLProc(PFNGLREADPIXELSPROC, glReadPixels);
LoadOGLProc(PFNGLROTATEFPROC, glRotatef);
LoadOGLProc(PFNGLSCALEFPROC, glScalef);
LoadOGLProc(PFNGLSHADEMODELPROC, glShadeModel);
LoadOGLProc(PFNGLTEXCOORD2FPROC, glTexCoord2f);
LoadOGLProc(PFNGLTEXCOORD2FVPROC, glTexCoord2fv);
LoadOGLProc(PFNGLTEXCOORD3FPROC, glTexCoord3f);
LoadOGLProc(PFNGLTEXCOORD3FVPROC, glTexCoord3fv);
LoadOGLProc(PFNGLTEXCOORD4FPROC, glTexCoord4f);
LoadOGLProc(PFNGLTEXCOORD4FVPROC, glTexCoord4fv);
LoadOGLProc(PFNGLTEXCOORDPOINTERPROC, glTexCoordPointer);
LoadOGLProc(PFNGLTEXENVFPROC, glTexEnvf);
LoadOGLProc(PFNGLTEXENVFVPROC, glTexEnvfv);
LoadOGLProc(PFNGLTEXENVIPROC, glTexEnvi);
LoadOGLProc(PFNGLTEXIMAGE2DPROC, glTexImage2D);
LoadOGLProc(PFNGLTEXPARAMETERFPROC, glTexParameterf);
LoadOGLProc(PFNGLTEXPARAMETERIPROC, glTexParameteri);
LoadOGLProc(PFNGLTEXSUBIMAGE2DPROC, glTexSubImage2D);
LoadOGLProc(PFNGLTRANSLATEFPROC, glTranslatef);
LoadOGLProc(PFNGLVERTEX2FPROC, glVertex2f);
LoadOGLProc(PFNGLVERTEX2FVPROC, glVertex2fv);
LoadOGLProc(PFNGLVERTEX3FPROC, glVertex3f);
LoadOGLProc(PFNGLVERTEX3FVPROC, glVertex3fv);
LoadOGLProc(PFNGLVERTEX4FPROC, glVertex4f);
LoadOGLProc(PFNGLVERTEX4FVPROC, glVertex4fv);
LoadOGLProc(PFNGLVERTEXPOINTERPROC, glVertexPointer);
LoadOGLProc(PFNGLVIEWPORTPROC, glViewport);
if (!mode) {
ogl_have_paletted_texture = 0;
ogl_have_secondary_color = 0;
ogl_use_paletted_texture = 0;
ogl_use_secondary_color = 0;
return;
}
if (ogl_missing_func) {
fprintf(stderr, "Unable to load OpenGL Library: missing function %s\n", ogl_missing_func);
exit(EXIT_FAILURE);
}
const char *ext = (const char *) pglGetString(GL_EXTENSIONS);
ogl_have_paletted_texture = check_token(ext, "GL_EXT_paletted_texture");
ogl_have_secondary_color = check_token(ext, "GL_EXT_secondary_color");
#ifndef GL_COLOR_TABLE_WIDTH_EXT
#define GL_COLOR_TABLE_WIDTH_EXT GL_COLOR_TABLE_WIDTH
#endif
if (ogl_have_paletted_texture) {
ogl_missing_func = NULL;
LoadOGLProc(PFNGLCOLORTABLEEXTPROC, glColorTableEXT);
LoadOGLProc(PFNGLGETCOLORTABLEPARAMETERIVEXTPROC, glGetColorTableParameterivEXT);
if (!ogl_missing_func) {
GLint size;
pglColorTableEXT(GL_PROXY_TEXTURE_2D, GL_RGBA, 256, GL_BGRA, GL_UNSIGNED_BYTE, NULL);
pglGetColorTableParameterivEXT(GL_PROXY_TEXTURE_2D, GL_COLOR_TABLE_WIDTH_EXT, &size);
if (size != 256) {
ogl_have_paletted_texture = 0;
}
} else {
ogl_have_paletted_texture = 0;
}
}
if (ogl_have_secondary_color) {
ogl_missing_func = NULL;
LoadOGLProc(PFNGLSECONDARYCOLOR3FEXTPROC, glSecondaryColor3fEXT);
LoadOGLProc(PFNGLSECONDARYCOLOR3FVEXTPROC, glSecondaryColor3fvEXT);
LoadOGLProc(PFNGLSECONDARYCOLOR3UBEXTPROC, glSecondaryColor3ubEXT);
LoadOGLProc(PFNGLSECONDARYCOLOR3UBVEXTPROC, glSecondaryColor3ubvEXT);
LoadOGLProc(PFNGLSECONDARYCOLORPOINTEREXTPROC, glSecondaryColorPointerEXT);
if (ogl_missing_func) {
ogl_have_secondary_color = 0;
}
}
ogl_use_paletted_texture = ogl_have_paletted_texture;
ogl_use_secondary_color = ogl_have_secondary_color;
// fprintf(stderr, "RENDER DEBUG: pal:%d sec:%d\n", ogl_use_paletted_texture, ogl_use_secondary_color);
}
int check_for_errors(const char *file, int line)
{
GLenum error;
int diderror = 0;
while ((error = pglGetError()) != GL_NO_ERROR) {
fprintf(stderr, "OPENGL ERROR: %04X (%s:%d)\n", error, file, line);
diderror = 1;
}
return diderror;
}
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