X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=demo_prior;a=blobdiff_plain;f=libs%2Fimago2%2Fsrc%2Fimago_gl.c;fp=libs%2Fimago2%2Fsrc%2Fimago_gl.c;h=5ac9ceb9c2b8debd188ca38372ff321151a8f217;hp=0000000000000000000000000000000000000000;hb=3a9f6854df479d81442273c9d0b133c49c5c8f66;hpb=0b24071f728b7c8550daa1b7aa7c4012cb70ef4c diff --git a/libs/imago2/src/imago_gl.c b/libs/imago2/src/imago_gl.c new file mode 100644 index 0000000..5ac9ceb --- /dev/null +++ b/libs/imago2/src/imago_gl.c @@ -0,0 +1,251 @@ +#include "imago2.h" + +/* to avoid dependency to OpenGL, I'll define all the relevant GL macros manually */ +#define GL_UNSIGNED_BYTE 0x1401 +#define GL_FLOAT 0x1406 + +#define GL_LUMINANCE 0x1909 +#define GL_RGB 0x1907 +#define GL_RGBA 0x1908 + +#define GL_RGBA32F 0x8814 +#define GL_RGB32F 0x8815 +#define GL_LUMINANCE32F 0x8818 + +#define GL_TEXTURE_2D 0x0de1 +#define GL_TEXTURE_WRAP_S 0x2802 +#define GL_TEXTURE_WRAP_T 0x2803 +#define GL_TEXTURE_MAG_FILTER 0x2800 +#define GL_TEXTURE_MIN_FILTER 0x2801 +#define GL_LINEAR 0x2601 +#define GL_LINEAR_MIPMAP_LINEAR 0x2703 +#define GL_REPEAT 0x2901 +#define GL_GENERATE_MIPMAP_SGIS 0x8191 + + +typedef unsigned int GLenum; +typedef unsigned int GLuint; +typedef int GLint; +typedef int GLsizei; +typedef void GLvoid; + +/* for the same reason I'll load GL functions dynamically */ +#ifndef WIN32 +typedef void (*gl_gen_textures_func)(GLsizei, GLuint*); +typedef void (*gl_bind_texture_func)(GLenum, GLuint); +typedef void (*gl_tex_parameteri_func)(GLenum, GLenum, GLint); +typedef void (*gl_tex_image2d_func)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid*); +typedef void (*gl_generate_mipmap_func)(GLenum); +typedef GLenum (*gl_get_error_func)(void); +#else +typedef void (__stdcall *gl_gen_textures_func)(GLsizei, GLuint*); +typedef void (__stdcall *gl_bind_texture_func)(GLenum, GLuint); +typedef void (__stdcall *gl_tex_parameteri_func)(GLenum, GLenum, GLint); +typedef void (__stdcall *gl_tex_image2d_func)(GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, const GLvoid*); +typedef void (__stdcall *gl_generate_mipmap_func)(GLenum); +typedef GLenum (__stdcall *gl_get_error_func)(void); +#endif + +static gl_gen_textures_func gl_gen_textures; +static gl_bind_texture_func gl_bind_texture; +static gl_tex_parameteri_func gl_tex_parameteri; +static gl_tex_image2d_func gl_tex_image2d; +static gl_generate_mipmap_func gl_generate_mipmap; +static gl_get_error_func gl_get_error; + +static int load_glfunc(void); + +unsigned int img_fmt_glfmt(enum img_fmt fmt) +{ + switch(fmt) { + case IMG_FMT_GREY8: + case IMG_FMT_GREYF: + return GL_LUMINANCE; + + case IMG_FMT_RGB24: + case IMG_FMT_RGBF: + return GL_RGB; + + case IMG_FMT_RGBA32: + case IMG_FMT_RGBAF: + return GL_RGBA; + + default: + break; + } + return 0; +} + +unsigned int img_fmt_gltype(enum img_fmt fmt) +{ + switch(fmt) { + case IMG_FMT_GREY8: + case IMG_FMT_RGB24: + case IMG_FMT_RGBA32: + return GL_UNSIGNED_BYTE; + + case IMG_FMT_GREYF: + case IMG_FMT_RGBF: + case IMG_FMT_RGBAF: + return GL_FLOAT; + + default: + break; + } + return 0; +} + +unsigned int img_fmt_glintfmt(enum img_fmt fmt) +{ + switch(fmt) { + case IMG_FMT_GREY8: + return GL_LUMINANCE; + case IMG_FMT_RGB24: + return GL_RGB; + case IMG_FMT_RGBA32: + return GL_RGBA; + case IMG_FMT_GREYF: + return GL_LUMINANCE32F; + case IMG_FMT_RGBF: + return GL_RGB32F; + case IMG_FMT_RGBAF: + return GL_RGBA32F; + default: + break; + } + return 0; +} + +unsigned int img_glfmt(struct img_pixmap *img) +{ + return img_fmt_glfmt(img->fmt); +} + +unsigned int img_gltype(struct img_pixmap *img) +{ + return img_fmt_gltype(img->fmt); +} + +unsigned int img_glintfmt(struct img_pixmap *img) +{ + return img_fmt_glintfmt(img->fmt); +} + +unsigned int img_gltexture(struct img_pixmap *img) +{ + unsigned int tex; + unsigned int intfmt, fmt, type; + + if(!gl_gen_textures) { + if(load_glfunc() == -1) { + fprintf(stderr, "imago: failed to initialize the OpenGL helpers\n"); + return 0; + } + } + + intfmt = img_glintfmt(img); + fmt = img_glfmt(img); + type = img_gltype(img); + + gl_gen_textures(1, &tex); + gl_bind_texture(GL_TEXTURE_2D, tex); + gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); + gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + gl_tex_parameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + if(!gl_generate_mipmap) { + gl_tex_parameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, 1); + gl_get_error(); /* clear errors in case SGIS_generate_mipmap is not supported */ + } + gl_tex_image2d(GL_TEXTURE_2D, 0, intfmt, img->width, img->height, 0, fmt, type, img->pixels); + if(gl_generate_mipmap) { + gl_generate_mipmap(GL_TEXTURE_2D); + } + return tex; +} + +unsigned int img_gltexture_load(const char *fname) +{ + struct img_pixmap img; + unsigned int tex; + + img_init(&img); + if(img_load(&img, fname) == -1) { + img_destroy(&img); + return 0; + } + + tex = img_gltexture(&img); + img_destroy(&img); + return tex; +} + +unsigned int img_gltexture_read_file(FILE *fp) +{ + struct img_pixmap img; + unsigned int tex; + + img_init(&img); + if(img_read_file(&img, fp) == -1) { + img_destroy(&img); + return 0; + } + + tex = img_gltexture(&img); + img_destroy(&img); + return tex; +} + +unsigned int img_gltexture_read(struct img_io *io) +{ + struct img_pixmap img; + unsigned int tex; + + img_init(&img); + if(img_read(&img, io) == -1) { + img_destroy(&img); + return 0; + } + + tex = img_gltexture(&img); + img_destroy(&img); + return tex; +} + +#if defined(__unix__) || defined(__APPLE__) +#include + +#ifndef RTLD_DEFAULT +#define RTLD_DEFAULT ((void*)0) +#endif + +#endif +#ifdef WIN32 +#include +#endif + +static int load_glfunc(void) +{ +#if defined(__unix__) || defined(__APPLE__) + gl_gen_textures = (gl_gen_textures_func)dlsym(RTLD_DEFAULT, "glGenTextures"); + gl_bind_texture = (gl_bind_texture_func)dlsym(RTLD_DEFAULT, "glBindTexture"); + gl_tex_parameteri = (gl_tex_parameteri_func)dlsym(RTLD_DEFAULT, "glTexParameteri"); + gl_tex_image2d = (gl_tex_image2d_func)dlsym(RTLD_DEFAULT, "glTexImage2D"); + gl_generate_mipmap = (gl_generate_mipmap_func)dlsym(RTLD_DEFAULT, "glGenerateMipmap"); + gl_get_error = (gl_get_error_func)dlsym(RTLD_DEFAULT, "glGetError"); +#endif + +#ifdef WIN32 + HANDLE dll = LoadLibrary("opengl32.dll"); + if(dll) { + gl_gen_textures = (gl_gen_textures_func)GetProcAddress(dll, "glGenTextures"); + gl_bind_texture = (gl_bind_texture_func)GetProcAddress(dll, "glBindTexture"); + gl_tex_parameteri = (gl_tex_parameteri_func)GetProcAddress(dll, "glTexParameteri"); + gl_tex_image2d = (gl_tex_image2d_func)GetProcAddress(dll, "glTexImage2D"); + gl_generate_mipmap = (gl_generate_mipmap_func)GetProcAddress(dll, "glGenerateMipmap"); + gl_get_error = (gl_get_error_func)GetProcAddress(dll, "glGetError"); + } +#endif + + return (gl_gen_textures && gl_bind_texture && gl_tex_parameteri && gl_tex_image2d && gl_get_error) ? 0 : -1; +}