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Diffstat (limited to 'opengl_loader.c')
| -rw-r--r-- | opengl_loader.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/opengl_loader.c b/opengl_loader.c new file mode 100644 index 0000000..9914e00 --- /dev/null +++ b/opengl_loader.c @@ -0,0 +1,210 @@ +#ifdef _WIN32 +typedef __int64 GLintptr; +#else +typedef intptr_t GLintptr; +#endif +typedef void GLvoid; +typedef unsigned char GLboolean; +typedef unsigned char GLubyte; +typedef char GLchar; + +typedef int GLint; +typedef int GLsizei; + +typedef unsigned int GLenum; +typedef unsigned int GLuint; +typedef unsigned int GLbitfield; + +typedef float GLfloat; +typedef double GLdouble; + +typedef unsigned long long GLsizeiptr; + +#define GL_NO_ERROR 0 +#define GL_INFO_LOG_LENGTH 0x8b84 +#define GL_ZERO 0x0000 +#define GL_ONE 0x0001 +#define GL_ALPHA 0x1906 +#define GL_BLEND 0x0be2 +#define GL_CLAMP_TO_EDGE 0x812f +#define GL_COLOR_BUFFER_BIT 0x4000 +#define GL_COMPILE_STATUS 0x8b81 +#define GL_DEPTH_TEST 0x0b71 +#define GL_FRAMEBUFFER_SRGB 0x8db9 +#define GL_FRAGMENT_SHADER 0x8b30 +#define GL_LINK_STATUS 0x8b82 +#define GL_MODELVIEW 0x1700 +#define GL_NEAREST 0x2600 +#define GL_ONE_MINUS_SRC_ALPHA 0x0303 +#define GL_PROJECTION 0x1701 +#define GL_QUADS 0x0007 +#define GL_RGBA 0x1908 +#define GL_RGBA8 0x8058 +#define GL_SCISSOR_TEST 0x0c11 +#define GL_SRGB8_ALPHA8 0x8c43 +#define GL_SRC_ALPHA 0x0302 +#define GL_TEXTURE0 0x84c0 +#define GL_TEXTURE_2D 0x0de1 +#define GL_TEXTURE_COORD_ARRAY 0x8078 +#define GL_TEXTURE_MAG_FILTER 0x2800 +#define GL_TEXTURE_MIN_FILTER 0x2801 +#define GL_TEXTURE_WRAP_S 0x2802 +#define GL_TEXTURE_WRAP_T 0x2803 +#define GL_UNSIGNED_BYTE 0x1401 +#define GL_UNSIGNED_INT_8_8_8_8 0x8035 +#define GL_VERTEX_SHADER 0x8b31 +#define GL_ARRAY_BUFFER 0x8892 +#define GL_ELEMENT_ARRAY_BUFFER 0x8893 +#define GL_STATIC_DRAW 0x88e4 +#define GL_FLOAT 0x1406 +#define GL_FALSE 0 +#define GL_TRUE 1 +#define GL_LINEAR 0x2601 +#define GL_FUNC_ADD 0x8006 +#define GL_CULL_FACE 0x0b44 +#define GL_STREAM_DRAW 0x88e0 +#define GL_WRITE_ONLY 0x88b9 +#define GL_TRIANGLES 0x0004 +#define GL_UNSIGNED_INT 0x1405 +#define GL_UNSIGNED_SHORT 0x1403 +#define GL_MULTISAMPLE 0x809d +#define GL_DYNAMIC_DRAW 0x88e8 +#define GL_RED 0x1903 +#define GL_FRAMEBUFFER_WIDTH 0x9310 +#define GL_FRAMEBUFFER_HEIGHT 0x9311 +#define GL_VIEWPORT 0x0ba2 +#define GL_PIXEL_UNPACK_BUFFER 0x88ec +#define GL_PIXEL_UNPACK_BUFFER_BINDING 0x88ef +#define GL_VERTEX_ARRAY_BINDING 0x85b5 +#define GL_ARRAY_BUFFER_BINDING 0x8894 +#define GL_ELEMENT_ARRAY_BUFFER_BINDING 0x8895 +#define GL_CURRENT_PROGRAM 0x8b8d +#define GL_TEXTURE_BINDING_2D 0x8069 +#define GL_LINEAR_MIPMAP_LINEAR 0x2703 +#define GL_SRGB_ALPHA 0x8c43 +#define GL_UNPACK_ROW_LENGTH 0x0cf2 +#define GL_UNPACK_SKIP_PIXELS 0x0cf4 +#define GL_UNPACK_SKIP_ROWS 0x0cf3 +#define GL_TRIANGLE_STRIP 0x0005 +#define GL_VERTEX_ATTRIB_ARRAY_ENABLED 0x8646 + +#define DECLARE_GL_FUNCTION(Name, ReturnType, ...) typedef ReturnType (*type_##Name)(__VA_ARGS__); +#define DECLARE_GLOBAL_FUNCTION(Name, ...) type_##Name Name; + +#define GL_FUNCTIONS(X) \ + X(glActiveTexture, void, GLenum texture) \ + X(glAttachShader, void, GLuint program, GLuint shader) \ + X(glBindBuffer, void, GLenum target, GLuint buffer) \ + X(glBindTexture, void, GLenum target, GLuint texture) \ + X(glBufferData, void, GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage) \ + X(glClear, void, GLbitfield mask) \ + X(glClearColor, void, GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha) \ + X(glCompileShader, void, GLuint shader) \ + X(glCreateProgram, GLuint) \ + X(glCreateShader, GLuint, GLenum type) \ + X(glDeleteShader, void, GLuint shader) \ + X(glDrawElements, void, GLenum mode, GLsizei count, GLenum type, const GLvoid *indices) \ + X(glEnableVertexAttribArray, void, GLuint index) \ + X(glGenBuffers, void, GLsizei n, GLuint *buffers) \ + X(glGenTextures, void, GLsizei n, GLuint *textures) \ + X(glGetShaderInfoLog, void, GLuint shader, GLsizei maxLength, GLsizei *length, GLchar *infoLog) \ + X(glGetShaderiv, void, GLuint shader, GLenum pname, GLint *params) \ + X(glGetUniformLocation, GLint, GLuint program, const GLchar *name) \ + X(glLinkProgram, void, GLuint program) \ + X(glShaderSource, void, GLuint shader, GLsizei count, const GLchar *const *string, const GLint *length) \ + X(glTexImage2D, void, GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid *pixels) \ + X(glTexParameteri, void, GLenum target, GLenum pname, GLint param) \ + X(glTexSubImage2D, void, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels) \ + X(glUniform1f, void, GLint location, GLfloat v0) \ + X(glUniform1i, void, GLint location, GLint v0) \ + X(glUniform2f, void, GLint location, GLfloat v0, GLfloat v1) \ + X(glUniform4f, void, GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3) \ + X(glUseProgram, void, GLuint program) \ + X(glVertexAttribPointer, void, GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer) \ + X(glViewport, void, GLint x, GLint y, GLsizei width, GLsizei height) \ + X(glDeleteProgram, void, GLuint program) \ + X(glDeleteBuffers, void, GLsizei n, const GLuint *buffers) \ + X(glDeleteTextures, void, GLsizei n, const GLuint *textures) \ + X(glEnable, void, GLenum cap) \ + X(glGenerateMipmap, void, GLenum target) \ + X(glGetProgramiv, void, GLuint program, GLenum pname, GLint *params) \ + X(glGetAttribLocation, GLint, GLuint program, const GLchar *name) \ + X(glDetachShader, void, GLuint program, GLuint shader) \ + X(glUniformMatrix4fv, void, GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) \ + X(glMapBuffer, void*, GLenum target, GLenum access) \ + X(glUnmapBuffer, GLboolean, GLenum target) \ + X(glBlendEquation, void, GLenum mode) \ + X(glBlendFunc, void, GLenum sfactor, GLenum dfactor) \ + X(glDisable, void, GLenum cap) \ + X(glScissor, void, GLint x, GLint y, GLsizei width, GLsizei height) \ + X(glTexCoord2f, void, GLfloat s, GLfloat t) \ + X(glVertex2f, void, GLfloat x, GLfloat y) \ + X(glGetError, GLenum) \ + X(glGetProgramInfoLog, void, GLuint program, GLsizei maxLength, GLsizei *length, GLchar *infoLog) \ + X(glGenVertexArrays, void, GLsizei n, GLuint *arrays) \ + X(glBindVertexArray, void, GLuint array) \ + X(glDeleteVertexArrays, void, GLsizei n, const GLuint *arrays) \ + X(glDrawArrays, void, GLenum mode, GLint first, GLsizei count) \ + X(glBufferSubData, void, GLenum target, GLintptr offset, GLsizeiptr size, const GLvoid *data) \ + X(glDisableVertexAttribArray, void, GLuint index) \ + X(glGetIntegerv, void, GLenum pname, GLint *data) \ + X(glBindAttribLocation, void, GLuint program, GLuint index, const GLchar *name) \ + X(glGetUniformfv, void, GLuint program, GLint location, GLfloat *params) \ + X(glPixelStorei, void, GLenum pname, GLint param) \ + X(glGetVertexAttribiv, void, GLuint index, GLenum pname, GLint *params) \ + X(glFinish, void) + +GL_FUNCTIONS(DECLARE_GL_FUNCTION) +GL_FUNCTIONS(DECLARE_GLOBAL_FUNCTION) + + +#if defined(_WIN32) +static void *get_any_gl_address(const char *name) { + void *p = (void *)wglGetProcAddress(name); + if(!p) { + HMODULE module = LoadLibraryA("opengl32.dll"); + if(module) { + p = (void *)GetProcAddress(module, name); + } + } + return p; +} + +#define GetOpenGLFunction(Name, ...) \ + *(void **)&Name = (void *)get_any_gl_address(#Name); \ + if(!Name) { \ + DEBUG_PRINT("Failed to load OpenGL function: %s\n", #Name); \ + exit(EXIT_FAILURE); \ + } + +#elif defined(__linux__) +#include <dlfcn.h> +static void *glXGetProcAddress(const GLubyte *procName) { + static void *(*glxGetProcAddress)(const GLubyte *); + if(!glxGetProcAddress) { + void *libGL = dlopen("libGL.so.1", RTLD_LAZY | RTLD_GLOBAL); + if(!libGL) { + DEBUG_PRINT("Error: Unable to load libGL.so.1\n"); + exit(EXIT_FAILURE); + } + glxGetProcAddress = (void *(*)(const GLubyte *))dlsym(libGL, "glXGetProcAddress"); + if(!glxGetProcAddress) { + DEBUG_PRINT("Error: Unable to find glXGetProcAddress\n"); + exit(EXIT_FAILURE); + } + } + return glxGetProcAddress(procName); +} + +#define GetOpenGLFunction(Name, ...) \ + *(void **)&Name = (void *)glXGetProcAddress((const GLubyte *)#Name); \ + if(!Name) { \ + DEBUG_PRINT("Failed to load OpenGL function: %s\n", #Name); \ + exit(EXIT_FAILURE); \ + } +#endif + +__attribute__((cold, noinline, section(".init_section"))) +static void gl_loader() { + GL_FUNCTIONS(GetOpenGLFunction); +};
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