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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include "opengl.h"
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5
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6 namespace gph {
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7
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8 GLCaps glcaps;
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9
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10 static void fill_glcaps();
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11 static void print_glcaps(GLCaps *caps);
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12
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13 bool init_opengl()
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14 {
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15 glewInit();
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16 fill_glcaps();
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17 return true;
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18 }
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19
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20 static void fill_glcaps()
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21 {
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22 memset(&glcaps, 0, sizeof glcaps);
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23
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24 glcaps.version = strdup((const char*)glGetString(GL_VERSION));
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25 glcaps.renderer = strdup((const char*)glGetString(GL_RENDERER));
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26 glcaps.vendor = strdup((const char*)glGetString(GL_VENDOR));
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27
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28 glcaps.sdr = GLEW_ARB_shading_language_100;
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29 if(glcaps.sdr) {
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30 glcaps.sdr_ver = strdup((const char*)glGetString(GL_SHADING_LANGUAGE_VERSION));
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31 }
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32
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33 glcaps.fbo = GLEW_ARB_framebuffer_object || GLEW_EXT_framebuffer_object;
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34 glcaps.tex_float = GLEW_ARB_texture_float;
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35 glcaps.npow2_tex = GLEW_ARB_texture_non_power_of_two;
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36 glcaps.fsaa = GLEW_ARB_multisample;
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37
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38 glGetIntegerv(GL_MAX_TEXTURE_UNITS, &glcaps.max_tex_units);
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39 if(glcaps.fbo) {
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40 glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &glcaps.max_mrt);
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41 }
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42 if(glcaps.fsaa) {
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43 glGetIntegerv(GL_MAX_SAMPLES, &glcaps.max_samples);
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44 } else {
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45 glcaps.max_samples = 1;
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46 }
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47 if(GLEW_EXT_texture_filter_anisotropic) {
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48 glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &glcaps.max_aniso);
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49 } else {
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50 glcaps.max_aniso = 1.0f;
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51 }
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52
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53 print_glcaps(&glcaps);
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54 }
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55
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56 static void print_glcaps(GLCaps *caps)
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57 {
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58 printf("OpenGL %s - %s - %s\n", caps->version, caps->vendor, caps->renderer);
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59
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60 printf("--- capabilities ---\n");
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61 printf(" GLSL shaders: %s\n", caps->sdr ? "yes" : "no");
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62 if(caps->sdr) {
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63 printf(" GLSL version: %s\n", caps->sdr_ver);
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64 }
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65 printf("framebuffer objects: %s\n", caps->fbo ? "yes" : "no");
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66 if(caps->fbo) {
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67 printf(" max render targets: %d\n", caps->max_mrt);
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68 }
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69 printf(" antialiasing: %s\n", caps->fsaa ? "yes" : "no");
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70 if(caps->fsaa) {
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71 printf(" max samples: %d\n", caps->max_samples);
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72 }
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73 printf(" float textures: %s\n", caps->tex_float ? "yes" : "no");
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74 printf(" non-pow2 textures: %s\n", caps->npow2_tex ? "yes" : "no");
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75 printf(" texture units: %d\n", caps->max_tex_units);
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76 printf("--------------------\n");
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77 }
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78
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79 } // namespace gph
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