dungeon_crawler

annotate prototype/src/renderer.cc @ 21:0588f8a1a351

find changesets by author, revision, files, or words in the commit message
converting LIGHT meshes to lights
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 21 Aug 2012 06:33:36 +0300
parents 48cfd351a9be
children fa8f89d06f6f
rev   line source
nuclear@15 1 #include <stdio.h>
nuclear@15 2 #include <stdlib.h>
nuclear@15 3 #include <string.h>
nuclear@15 4 #include <limits.h>
nuclear@18 5 #include <assert.h>
nuclear@15 6 #include "opengl.h"
nuclear@15 7 #include "renderer.h"
nuclear@15 8 #include "sdr.h"
nuclear@15 9 #include "datapath.h"
nuclear@15 10
nuclear@18 11
nuclear@17 12 static bool create_fbo(int xsz, int ysz);
nuclear@18 13 static unsigned int load_sdr(const char *vfname, const char *pfname);
nuclear@17 14 static int round_pow2(int x);
nuclear@15 15
nuclear@17 16
nuclear@19 17 #define MRT_COUNT 4
nuclear@17 18 static unsigned int mrt_tex[MRT_COUNT];
nuclear@17 19
nuclear@17 20 static unsigned int mrt_prog;
nuclear@18 21 static unsigned int deferred_omni, deferred_debug;
nuclear@17 22
nuclear@17 23 static unsigned int fbo, rbuf_depth;
nuclear@17 24 static const char *fbstname[] = {
nuclear@17 25 "GL_FRAMEBUFFER_COMPLETE",
nuclear@17 26 "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT",
nuclear@17 27 "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",
nuclear@17 28 "no such fbo error",
nuclear@17 29 "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS",
nuclear@17 30 "GL_FRAMEBUFFER_INCOMPLETE_FORMATS",
nuclear@17 31 "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER",
nuclear@17 32 "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER",
nuclear@17 33 "GL_FRAMEBUFFER_UNSUPPORTED"
nuclear@15 34 };
nuclear@15 35
nuclear@17 36 static int fb_xsz, fb_ysz, tex_xsz, tex_ysz;
nuclear@15 37
nuclear@21 38
nuclear@21 39
nuclear@17 40 bool init_renderer(int xsz, int ysz)
nuclear@17 41 {
nuclear@21 42 if(!GLEW_ARB_draw_buffers) {
nuclear@21 43 fprintf(stderr, "OpenGL implementation doesn't support multiple render targets\n");
nuclear@21 44 return false;
nuclear@21 45 }
nuclear@21 46
nuclear@19 47 int max_draw_buf;
nuclear@19 48 glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buf);
nuclear@19 49 printf("max draw buffers: %d\n", max_draw_buf);
nuclear@19 50 if(max_draw_buf < MRT_COUNT) {
nuclear@19 51 fprintf(stderr, "OpenGL implementation doesn't support enough draw buffers\n");
nuclear@19 52 return false;
nuclear@19 53 }
nuclear@19 54
nuclear@17 55 if(!create_fbo(xsz, ysz)) {
nuclear@17 56 return false;
nuclear@17 57 }
nuclear@19 58 CHECKGLERR;
nuclear@18 59
nuclear@18 60 if(!(mrt_prog = load_sdr("mrt.v.glsl", "mrt.p.glsl"))) {
nuclear@18 61 return false;
nuclear@18 62 }
nuclear@18 63 if(!(deferred_debug = load_sdr("deferred.v.glsl", "deferred.p.glsl"))) {
nuclear@17 64 return false;
nuclear@17 65 }
nuclear@17 66 return true;
nuclear@17 67 }
nuclear@17 68
nuclear@17 69 void destroy_renderer()
nuclear@17 70 {
nuclear@17 71 free_program(mrt_prog);
nuclear@17 72 free_program(deferred_omni);
nuclear@17 73
nuclear@17 74 glDeleteTextures(MRT_COUNT, mrt_tex);
nuclear@17 75 glDeleteFramebuffersEXT(1, &fbo);
nuclear@17 76 }
nuclear@17 77
nuclear@17 78 void render_deferred(void (*draw_func)())
nuclear@17 79 {
nuclear@18 80 int loc;
nuclear@18 81
nuclear@18 82 // render into the MRT buffers
nuclear@18 83 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@19 84
nuclear@18 85 glUseProgram(mrt_prog);
nuclear@20 86 if((loc = glGetUniformLocation(mrt_prog, "tex_dif")) != -1) {
nuclear@20 87 glUniform1i(loc, 0);
nuclear@20 88 }
nuclear@20 89 if((loc = glGetUniformLocation(mrt_prog, "tex_norm")) != -1) {
nuclear@20 90 glUniform1i(loc, 1);
nuclear@20 91 }
nuclear@17 92 draw_func();
nuclear@20 93
nuclear@18 94 glUseProgram(0);
nuclear@18 95 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@18 96
nuclear@18 97
nuclear@18 98 // post-process lighting
nuclear@18 99 glPushAttrib(GL_ENABLE_BIT);
nuclear@18 100
nuclear@18 101 glDisable(GL_LIGHTING);
nuclear@18 102 glDisable(GL_DEPTH_TEST);
nuclear@18 103
nuclear@18 104 glUseProgram(deferred_debug);
nuclear@19 105 for(int i=0; i<MRT_COUNT; i++) {
nuclear@19 106 char uname[32];
nuclear@19 107
nuclear@19 108 sprintf(uname, "mrt%d", i);
nuclear@19 109 if((loc = glGetUniformLocation(deferred_debug, uname)) != -1) {
nuclear@19 110 glUniform1i(loc, i);
nuclear@19 111 }
nuclear@19 112
nuclear@19 113 glActiveTexture(GL_TEXTURE0 + i);
nuclear@19 114 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
nuclear@19 115 glEnable(GL_TEXTURE_2D);
nuclear@18 116 }
nuclear@18 117 if((loc = glGetUniformLocation(deferred_debug, "tex_scale")) != -1) {
nuclear@18 118 glUniform2f(loc, (float)fb_xsz / tex_xsz, (float)fb_ysz / tex_ysz);
nuclear@18 119 }
nuclear@18 120
nuclear@18 121 glBegin(GL_QUADS);
nuclear@18 122 glTexCoord2f(0, 0);
nuclear@18 123 glVertex2f(-1, -1);
nuclear@18 124 glTexCoord2f(1, 0);
nuclear@18 125 glVertex2f(1, -1);
nuclear@18 126 glTexCoord2f(1, 1);
nuclear@18 127 glVertex2f(1, 1);
nuclear@18 128 glTexCoord2f(0, 1);
nuclear@18 129 glVertex2f(-1, 1);
nuclear@18 130 glEnd();
nuclear@18 131
nuclear@19 132 for(int i=0; i<MRT_COUNT; i++) {
nuclear@19 133 glActiveTexture(GL_TEXTURE0 + MRT_COUNT - i - 1);
nuclear@19 134 glDisable(GL_TEXTURE_2D);
nuclear@19 135 }
nuclear@19 136
nuclear@18 137 glUseProgram(0);
nuclear@18 138 glPopAttrib();
nuclear@17 139 }
nuclear@17 140
nuclear@17 141 static bool create_fbo(int xsz, int ysz)
nuclear@17 142 {
nuclear@17 143 unsigned int clamp = GL_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;
nuclear@17 144
nuclear@17 145 tex_xsz = round_pow2(xsz);
nuclear@17 146 tex_ysz = round_pow2(ysz);
nuclear@17 147 fb_xsz = xsz;
nuclear@17 148 fb_ysz = ysz;
nuclear@17 149
nuclear@17 150 if(!glGenFramebuffersEXT) {
nuclear@17 151 fprintf(stderr, "FBO support missing\n");
nuclear@17 152 return false;
nuclear@17 153 }
nuclear@17 154 glGenFramebuffersEXT(1, &fbo);
nuclear@18 155 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@17 156
nuclear@17 157 glGenTextures(MRT_COUNT, mrt_tex);
nuclear@17 158 for(int i=0; i<MRT_COUNT; i++) {
nuclear@17 159 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
nuclear@17 160 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, clamp);
nuclear@17 161 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, clamp);
nuclear@17 162 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@17 163 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@17 164 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_xsz, tex_ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@17 165
nuclear@17 166 // attach to fbo
nuclear@20 167 glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
nuclear@20 168 GL_TEXTURE_2D, mrt_tex[i], 0);
nuclear@18 169 CHECKGLERR;
nuclear@17 170 }
nuclear@17 171
nuclear@20 172 static GLenum draw_bufs[] = {
nuclear@20 173 GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT,
nuclear@20 174 GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT,
nuclear@20 175 GL_COLOR_ATTACHMENT4_EXT, GL_COLOR_ATTACHMENT5_EXT,
nuclear@20 176 GL_COLOR_ATTACHMENT6_EXT, GL_COLOR_ATTACHMENT7_EXT
nuclear@20 177 };
nuclear@20 178 glDrawBuffersARB(MRT_COUNT, draw_bufs);
nuclear@20 179
nuclear@18 180 glGenRenderbuffersEXT(1, &rbuf_depth);
nuclear@18 181 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);
nuclear@18 182 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@18 183 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth);
nuclear@18 184
nuclear@17 185 int fbst = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
nuclear@17 186 if(fbst != GL_FRAMEBUFFER_COMPLETE) {
nuclear@17 187 fprintf(stderr, "incomplete fbo: %u (%s)\n", fbo, fbstname[fbst - GL_FRAMEBUFFER_COMPLETE]);
nuclear@17 188 return false;
nuclear@17 189 }
nuclear@18 190 CHECKGLERR;
nuclear@18 191
nuclear@18 192 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@17 193 return true;
nuclear@17 194 }
nuclear@17 195
nuclear@18 196 static unsigned int load_sdr(const char *vfname, const char *pfname)
nuclear@15 197 {
nuclear@15 198 char vsfile[PATH_MAX], psfile[PATH_MAX];
nuclear@15 199 const char *fname;
nuclear@18 200 unsigned int prog;
nuclear@15 201
nuclear@18 202 if((fname = datafile_path(vfname))) {
nuclear@17 203 strcpy(vsfile, fname);
nuclear@17 204 } else {
nuclear@17 205 vsfile[0] = 0;
nuclear@17 206 }
nuclear@18 207 if((fname = datafile_path(pfname))) {
nuclear@17 208 strcpy(psfile, fname);
nuclear@17 209 } else {
nuclear@17 210 psfile[0] = 0;
nuclear@17 211 }
nuclear@18 212 if(!(prog = create_program_load(vsfile, psfile))) {
nuclear@18 213 fprintf(stderr, "failed to load shader program (%s, %s)\n", vsfile, psfile);
nuclear@18 214 return 0;
nuclear@15 215 }
nuclear@18 216 return prog;
nuclear@15 217 }
nuclear@15 218
nuclear@17 219 static int round_pow2(int x)
nuclear@15 220 {
nuclear@17 221 x--;
nuclear@17 222 x = (x >> 1) | x;
nuclear@17 223 x = (x >> 2) | x;
nuclear@17 224 x = (x >> 4) | x;
nuclear@17 225 x = (x >> 8) | x;
nuclear@17 226 x = (x >> 16) | x;
nuclear@17 227 return x + 1;
nuclear@15 228 }