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#include "../include/mgl/gl.h"
#include <dlfcn.h>
#include <stdio.h>
#include <string.h>
typedef struct {
void **func;
const char *name;
} dlsym_assign;
static void* dlsym_print_fail(void *handle, const char *name, int required) {
dlerror();
void *sym = dlsym(handle, name);
char *err_str = dlerror();
if(!sym)
fprintf(stderr, "mgl %s: dlsym(handle, \"%s\") failed, error: %s\n", required ? "error" : "warning", name, err_str ? err_str : "(null)");
return sym;
}
static int mgl_gl_load_gl(mgl_gl *self) {
const dlsym_assign required_dlsym[] = {
{ (void**)&self->glViewport, "glViewport" },
{ (void**)&self->glScissor, "glScissor" },
{ (void**)&self->glClearColor, "glClearColor" },
{ (void**)&self->glClear, "glClear" },
{ (void**)&self->glEnable, "glEnable" },
{ (void**)&self->glBlendFunc, "glBlendFunc" },
{ (void**)&self->glGenTextures, "glGenTextures" },
{ (void**)&self->glDeleteTextures, "glDeleteTextures" },
{ (void**)&self->glTexImage2D, "glTexImage2D" },
{ (void**)&self->glTexSubImage2D, "glTexSubImage2D" },
{ (void**)&self->glBindTexture, "glBindTexture" },
{ (void**)&self->glTexParameteri, "glTexParameteri" },
{ (void**)&self->glBegin, "glBegin" },
{ (void**)&self->glEnd, "glEnd" },
{ (void**)&self->glVertex3f, "glVertex3f" },
{ (void**)&self->glColor4ub, "glColor4ub" },
{ (void**)&self->glTexCoord2f, "glTexCoord2f" },
{ (void**)&self->glOrtho, "glOrtho" },
{ (void**)&self->glMatrixMode, "glMatrixMode" },
{ (void**)&self->glPushMatrix, "glPushMatrix" },
{ (void**)&self->glPopMatrix, "glPopMatrix" },
{ (void**)&self->glLoadIdentity, "glLoadIdentity" },
{ (void**)&self->glLoadMatrixf, "glLoadMatrixf" },
{ (void**)&self->glTranslatef, "glTranslatef" },
{ (void**)&self->glRotatef, "glRotatef" },
{ (void**)&self->glGenBuffers, "glGenBuffers" },
{ (void**)&self->glBindBuffer, "glBindBuffer" },
{ (void**)&self->glDeleteBuffers, "glDeleteBuffers" },
{ (void**)&self->glBufferData, "glBufferData" },
{ (void**)&self->glBufferSubData, "glBufferSubData" },
{ (void**)&self->glDrawArrays, "glDrawArrays" },
{ (void**)&self->glEnableClientState, "glEnableClientState" },
{ (void**)&self->glVertexPointer, "glVertexPointer" },
{ (void**)&self->glColorPointer, "glColorPointer" },
{ (void**)&self->glTexCoordPointer, "glTexCoordPointer" },
{ (void**)&self->glCompileShader, "glCompileShader" },
{ (void**)&self->glCreateProgram, "glCreateProgram" },
{ (void**)&self->glCreateShader, "glCreateShader" },
{ (void**)&self->glDeleteProgram, "glDeleteProgram" },
{ (void**)&self->glDeleteShader, "glDeleteShader" },
{ (void**)&self->glGetShaderiv, "glGetShaderiv" },
{ (void**)&self->glGetShaderInfoLog, "glGetShaderInfoLog" },
{ (void**)&self->glGetProgramiv, "glGetProgramiv" },
{ (void**)&self->glGetProgramInfoLog, "glGetProgramInfoLog" },
{ (void**)&self->glLinkProgram, "glLinkProgram" },
{ (void**)&self->glShaderSource, "glShaderSource" },
{ (void**)&self->glUseProgram, "glUseProgram" },
{ (void**)&self->glAttachShader, "glAttachShader" },
{ (void**)&self->glGetUniformLocation, "glGetUniformLocation" },
{ (void**)&self->glUniform1f, "glUniform1f" },
{ (void**)&self->glUniform2f, "glUniform2f" },
{ (void**)&self->glUniform3f, "glUniform3f" },
{ (void**)&self->glUniform4f, "glUniform4f" },
{ (void**)&self->glGetError, "glGetError" },
{ (void**)&self->glGetString, "glGetString" },
{ (void**)&self->glGetIntegerv, "glGetIntegerv" },
{ (void**)&self->glPixelStorei, "glPixelStorei" },
{ (void**)&self->glFlush, "glFlush" },
{ (void**)&self->glFinish, "glFinish" },
{ NULL, NULL }
};
for(int i = 0; required_dlsym[i].func; ++i) {
*required_dlsym[i].func = dlsym_print_fail(self->gl_library, required_dlsym[i].name, 1);
if(!*required_dlsym[i].func)
return -1;
}
const dlsym_assign optional_dlsym[] = {
{ (void**)&self->glGenerateMipmap, "glGenerateMipmap" },
{ NULL, NULL }
};
for(int i = 0; optional_dlsym[i].func; ++i) {
*optional_dlsym[i].func = dlsym_print_fail(self->gl_library, optional_dlsym[i].name, 0);
}
return 0;
}
static int mgl_gl_load_glx(mgl_gl *self) {
const dlsym_assign required_dlsym[] = {
{ (void**)&self->glXGetProcAddress, "glXGetProcAddress" },
{ (void**)&self->glXCreateNewContext, "glXCreateNewContext" },
{ (void**)&self->glXMakeContextCurrent, "glXMakeContextCurrent" },
{ (void**)&self->glXDestroyContext, "glXDestroyContext" },
{ (void**)&self->glXSwapBuffers, "glXSwapBuffers" },
{ (void**)&self->glXChooseFBConfig, "glXChooseFBConfig" },
{ (void**)&self->glXGetVisualFromFBConfig, "glXGetVisualFromFBConfig" },
{ NULL, NULL }
};
/* In some distros (alpine for example libGLX doesn't exist, but libGL can be used instead) */
void *library = self->glx_library ? self->glx_library : self->gl_library;
for(int i = 0; required_dlsym[i].func; ++i) {
*required_dlsym[i].func = dlsym_print_fail(library, required_dlsym[i].name, 1);
if(!*required_dlsym[i].func)
return -1;
}
self->glXSwapIntervalEXT = (FUNC_glXSwapIntervalEXT)self->glXGetProcAddress((const unsigned char*)"glXSwapIntervalEXT");
self->glXSwapIntervalMESA = (FUNC_glXSwapIntervalMESA)self->glXGetProcAddress((const unsigned char*)"glXSwapIntervalMESA");
self->glXSwapIntervalSGI = (FUNC_glXSwapIntervalSGI)self->glXGetProcAddress((const unsigned char*)"glXSwapIntervalSGI");
return 0;
}
static int mgl_gl_load_egl(mgl_gl *self) {
const dlsym_assign required_dlsym[] = {
{ (void**)&self->eglGetProcAddress, "eglGetProcAddress" },
{ (void**)&self->eglGetDisplay, "eglGetDisplay" },
{ (void**)&self->eglInitialize, "eglInitialize" },
{ (void**)&self->eglTerminate, "eglTerminate" },
{ (void**)&self->eglGetConfigs, "eglGetConfigs" },
{ (void**)&self->eglCreateWindowSurface, "eglCreateWindowSurface" },
{ (void**)&self->eglCreateContext, "eglCreateContext" },
{ (void**)&self->eglMakeCurrent, "eglMakeCurrent" },
{ (void**)&self->eglDestroyContext, "eglDestroyContext" },
{ (void**)&self->eglDestroySurface, "eglDestroySurface" },
{ (void**)&self->eglSwapInterval, "eglSwapInterval" },
{ (void**)&self->eglSwapBuffers, "eglSwapBuffers" },
{ (void**)&self->eglBindAPI, "eglBindAPI" },
{ (void**)&self->eglGetConfigAttrib, "eglGetConfigAttrib" },
{ NULL, NULL }
};
for(int i = 0; required_dlsym[i].func; ++i) {
*required_dlsym[i].func = dlsym_print_fail(self->egl_library, required_dlsym[i].name, 1);
if(!*required_dlsym[i].func)
return -1;
}
return 0;
}
int mgl_gl_load(mgl_gl *self) {
memset(self, 0, sizeof(*self));
self->gl_library = dlopen("libGL.so.1", RTLD_LAZY);
if(!self->gl_library) {
fprintf(stderr, "mgl error:dlopen(\"%s\", RTLD_LAZY) failed\n", "libGL.so.1");
mgl_gl_unload(self);
return -1;
}
self->glx_library = dlopen("libGLX.so.0", RTLD_LAZY);
self->egl_library = dlopen("libEGL.so.1", RTLD_LAZY);
if(!self->egl_library) {
fprintf(stderr, "mgl error:dlopen(\"%s\", RTLD_LAZY) failed\n", "libEGL.so.1");
mgl_gl_unload(self);
return -1;
}
if(mgl_gl_load_gl(self) != 0) {
mgl_gl_unload(self);
return -1;
}
if(mgl_gl_load_glx(self) != 0) {
mgl_gl_unload(self);
return -1;
}
if(mgl_gl_load_egl(self) != 0) {
mgl_gl_unload(self);
return -1;
}
return 0;
}
void mgl_gl_unload(mgl_gl *self) {
if(self->egl_library) {
dlclose(self->egl_library);
self->egl_library = NULL;
}
if(self->glx_library) {
dlclose(self->glx_library);
self->glx_library = NULL;
}
if(self->gl_library) {
dlclose(self->gl_library);
self->gl_library = NULL;
}
}
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