dungeon_crawler

annotate prototype/src/renderer.cc @ 32:0cd55268eaf4

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AAAAaaaarghhhh... forgot to request floating point pixel format for MRT textures...
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 28 Aug 2012 02:18:19 +0300
parents 938a6a155c94
children 0357994effe2
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@23 8 #include "level.h"
nuclear@15 9 #include "sdr.h"
nuclear@15 10 #include "datapath.h"
nuclear@15 11
nuclear@18 12
nuclear@17 13 static bool create_fbo(int xsz, int ysz);
nuclear@18 14 static unsigned int load_sdr(const char *vfname, const char *pfname);
nuclear@17 15 static int round_pow2(int x);
nuclear@15 16
nuclear@17 17
nuclear@19 18 #define MRT_COUNT 4
nuclear@17 19 static unsigned int mrt_tex[MRT_COUNT];
nuclear@17 20
nuclear@17 21 static unsigned int mrt_prog;
nuclear@18 22 static unsigned int deferred_omni, deferred_debug;
nuclear@17 23
nuclear@17 24 static unsigned int fbo, rbuf_depth;
nuclear@17 25 static const char *fbstname[] = {
nuclear@17 26 "GL_FRAMEBUFFER_COMPLETE",
nuclear@17 27 "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT",
nuclear@17 28 "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",
nuclear@17 29 "no such fbo error",
nuclear@17 30 "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS",
nuclear@17 31 "GL_FRAMEBUFFER_INCOMPLETE_FORMATS",
nuclear@17 32 "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER",
nuclear@17 33 "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER",
nuclear@17 34 "GL_FRAMEBUFFER_UNSUPPORTED"
nuclear@15 35 };
nuclear@15 36
nuclear@17 37 static int fb_xsz, fb_ysz, tex_xsz, tex_ysz;
nuclear@15 38
nuclear@21 39
nuclear@21 40
nuclear@17 41 bool init_renderer(int xsz, int ysz)
nuclear@17 42 {
nuclear@32 43 if(!GLEW_ARB_texture_float) {
nuclear@32 44 fprintf(stderr, "Error: OpenGL implementation doesn't support floating point textures\n");
nuclear@32 45 return false;
nuclear@32 46 }
nuclear@21 47 if(!GLEW_ARB_draw_buffers) {
nuclear@32 48 fprintf(stderr, "Error: OpenGL implementation doesn't support multiple render targets\n");
nuclear@21 49 return false;
nuclear@21 50 }
nuclear@21 51
nuclear@19 52 int max_draw_buf;
nuclear@19 53 glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buf);
nuclear@19 54 printf("max draw buffers: %d\n", max_draw_buf);
nuclear@19 55 if(max_draw_buf < MRT_COUNT) {
nuclear@19 56 fprintf(stderr, "OpenGL implementation doesn't support enough draw buffers\n");
nuclear@19 57 return false;
nuclear@19 58 }
nuclear@19 59
nuclear@17 60 if(!create_fbo(xsz, ysz)) {
nuclear@17 61 return false;
nuclear@17 62 }
nuclear@19 63 CHECKGLERR;
nuclear@18 64
nuclear@18 65 if(!(mrt_prog = load_sdr("mrt.v.glsl", "mrt.p.glsl"))) {
nuclear@18 66 return false;
nuclear@18 67 }
nuclear@23 68 set_uniform_int(mrt_prog, "tex_dif", 0);
nuclear@23 69 set_uniform_int(mrt_prog, "tex_norm", 1);
nuclear@23 70
nuclear@18 71 if(!(deferred_debug = load_sdr("deferred.v.glsl", "deferred.p.glsl"))) {
nuclear@17 72 return false;
nuclear@17 73 }
nuclear@23 74 for(int i=0; i<MRT_COUNT; i++) {
nuclear@23 75 char uname[32];
nuclear@23 76 sprintf(uname, "mrt%d", i);
nuclear@23 77 set_uniform_int(deferred_debug, uname, i);
nuclear@23 78 }
nuclear@23 79
nuclear@30 80 if(!(deferred_omni = load_sdr("deferred_omni.v.glsl", "deferred_omni.p.glsl"))) {
nuclear@23 81 return false;
nuclear@23 82 }
nuclear@23 83 for(int i=0; i<MRT_COUNT; i++) {
nuclear@23 84 char uname[32];
nuclear@23 85 sprintf(uname, "mrt%d", i);
nuclear@23 86 set_uniform_int(deferred_omni, uname, i);
nuclear@23 87 }
nuclear@17 88 return true;
nuclear@17 89 }
nuclear@17 90
nuclear@17 91 void destroy_renderer()
nuclear@17 92 {
nuclear@17 93 free_program(mrt_prog);
nuclear@17 94 free_program(deferred_omni);
nuclear@17 95
nuclear@17 96 glDeleteTextures(MRT_COUNT, mrt_tex);
nuclear@17 97 glDeleteFramebuffersEXT(1, &fbo);
nuclear@17 98 }
nuclear@17 99
nuclear@23 100 void resize_renderer(int xsz, int ysz)
nuclear@17 101 {
nuclear@23 102 fb_xsz = xsz;
nuclear@23 103 fb_ysz = ysz;
nuclear@18 104
nuclear@23 105 // if we need a bigger rendertarget resize all colorbuffer textures and the depth buffer
nuclear@23 106 if(xsz > tex_xsz || ysz > tex_ysz) {
nuclear@23 107 tex_xsz = round_pow2(xsz);
nuclear@23 108 tex_ysz = round_pow2(ysz);
nuclear@23 109
nuclear@23 110 for(int i=0; i<MRT_COUNT; i++) {
nuclear@23 111 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
nuclear@32 112 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, tex_xsz, tex_ysz, 0, GL_RGBA, GL_FLOAT, 0);
nuclear@23 113 }
nuclear@23 114
nuclear@23 115 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);
nuclear@23 116 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@23 117 }
nuclear@23 118
nuclear@23 119
nuclear@23 120 // update the texture coordinate scaling factors
nuclear@23 121 float tex_scale_x = (float)fb_xsz / tex_xsz;
nuclear@23 122 float tex_scale_y = (float)fb_ysz / tex_ysz;
nuclear@23 123
nuclear@23 124 set_uniform_float2(deferred_omni, "tex_scale", tex_scale_x, tex_scale_y);
nuclear@30 125 set_uniform_float2(deferred_omni, "fb_size", fb_xsz, fb_ysz);
nuclear@30 126
nuclear@23 127 set_uniform_float2(deferred_debug, "tex_scale", tex_scale_x, tex_scale_y);
nuclear@23 128 }
nuclear@23 129
nuclear@23 130 void render_deferred(const Level *level)
nuclear@23 131 {
nuclear@18 132 // render into the MRT buffers
nuclear@23 133 glUseProgram(mrt_prog);
nuclear@18 134 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@19 135
nuclear@23 136 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@23 137 level->draw();
nuclear@20 138
nuclear@18 139 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@18 140
nuclear@18 141
nuclear@18 142 // post-process lighting
nuclear@18 143 glPushAttrib(GL_ENABLE_BIT);
nuclear@18 144
nuclear@30 145 glEnable(GL_BLEND);
nuclear@30 146 glBlendFunc(GL_ONE, GL_ONE);
nuclear@30 147
nuclear@18 148 glDisable(GL_LIGHTING);
nuclear@30 149 glDisable(GL_CULL_FACE);
nuclear@30 150 glDisable(GL_DEPTH_TEST);
nuclear@18 151
nuclear@23 152 glUseProgram(deferred_omni);
nuclear@19 153 for(int i=0; i<MRT_COUNT; i++) {
nuclear@19 154 glActiveTexture(GL_TEXTURE0 + i);
nuclear@19 155 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
nuclear@19 156 glEnable(GL_TEXTURE_2D);
nuclear@18 157 }
nuclear@18 158
nuclear@23 159 glDepthMask(0);
nuclear@23 160 level->draw_lights();
nuclear@23 161 glDepthMask(1);
nuclear@18 162
nuclear@19 163 for(int i=0; i<MRT_COUNT; i++) {
nuclear@19 164 glActiveTexture(GL_TEXTURE0 + MRT_COUNT - i - 1);
nuclear@19 165 glDisable(GL_TEXTURE_2D);
nuclear@19 166 }
nuclear@19 167
nuclear@18 168 glUseProgram(0);
nuclear@18 169 glPopAttrib();
nuclear@17 170 }
nuclear@17 171
nuclear@17 172 static bool create_fbo(int xsz, int ysz)
nuclear@17 173 {
nuclear@17 174 unsigned int clamp = GL_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;
nuclear@17 175
nuclear@17 176 tex_xsz = round_pow2(xsz);
nuclear@17 177 tex_ysz = round_pow2(ysz);
nuclear@17 178 fb_xsz = xsz;
nuclear@17 179 fb_ysz = ysz;
nuclear@17 180
nuclear@17 181 if(!glGenFramebuffersEXT) {
nuclear@17 182 fprintf(stderr, "FBO support missing\n");
nuclear@17 183 return false;
nuclear@17 184 }
nuclear@17 185 glGenFramebuffersEXT(1, &fbo);
nuclear@18 186 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@17 187
nuclear@17 188 glGenTextures(MRT_COUNT, mrt_tex);
nuclear@17 189 for(int i=0; i<MRT_COUNT; i++) {
nuclear@17 190 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
nuclear@17 191 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, clamp);
nuclear@17 192 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, clamp);
nuclear@17 193 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@17 194 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@32 195 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, tex_xsz, tex_ysz, 0, GL_RGBA, GL_FLOAT, 0);
nuclear@17 196
nuclear@17 197 // attach to fbo
nuclear@20 198 glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
nuclear@20 199 GL_TEXTURE_2D, mrt_tex[i], 0);
nuclear@18 200 CHECKGLERR;
nuclear@17 201 }
nuclear@17 202
nuclear@20 203 static GLenum draw_bufs[] = {
nuclear@20 204 GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT,
nuclear@20 205 GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT,
nuclear@20 206 GL_COLOR_ATTACHMENT4_EXT, GL_COLOR_ATTACHMENT5_EXT,
nuclear@20 207 GL_COLOR_ATTACHMENT6_EXT, GL_COLOR_ATTACHMENT7_EXT
nuclear@20 208 };
nuclear@20 209 glDrawBuffersARB(MRT_COUNT, draw_bufs);
nuclear@20 210
nuclear@18 211 glGenRenderbuffersEXT(1, &rbuf_depth);
nuclear@18 212 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);
nuclear@18 213 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@18 214 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth);
nuclear@18 215
nuclear@17 216 int fbst = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
nuclear@17 217 if(fbst != GL_FRAMEBUFFER_COMPLETE) {
nuclear@17 218 fprintf(stderr, "incomplete fbo: %u (%s)\n", fbo, fbstname[fbst - GL_FRAMEBUFFER_COMPLETE]);
nuclear@17 219 return false;
nuclear@17 220 }
nuclear@18 221 CHECKGLERR;
nuclear@18 222
nuclear@18 223 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@17 224 return true;
nuclear@17 225 }
nuclear@17 226
nuclear@18 227 static unsigned int load_sdr(const char *vfname, const char *pfname)
nuclear@15 228 {
nuclear@15 229 char vsfile[PATH_MAX], psfile[PATH_MAX];
nuclear@15 230 const char *fname;
nuclear@18 231 unsigned int prog;
nuclear@15 232
nuclear@18 233 if((fname = datafile_path(vfname))) {
nuclear@17 234 strcpy(vsfile, fname);
nuclear@17 235 } else {
nuclear@17 236 vsfile[0] = 0;
nuclear@17 237 }
nuclear@18 238 if((fname = datafile_path(pfname))) {
nuclear@17 239 strcpy(psfile, fname);
nuclear@17 240 } else {
nuclear@17 241 psfile[0] = 0;
nuclear@17 242 }
nuclear@18 243 if(!(prog = create_program_load(vsfile, psfile))) {
nuclear@18 244 fprintf(stderr, "failed to load shader program (%s, %s)\n", vsfile, psfile);
nuclear@18 245 return 0;
nuclear@15 246 }
nuclear@18 247 return prog;
nuclear@15 248 }
nuclear@15 249
nuclear@17 250 static int round_pow2(int x)
nuclear@15 251 {
nuclear@17 252 x--;
nuclear@17 253 x = (x >> 1) | x;
nuclear@17 254 x = (x >> 2) | x;
nuclear@17 255 x = (x >> 4) | x;
nuclear@17 256 x = (x >> 8) | x;
nuclear@17 257 x = (x >> 16) | x;
nuclear@17 258 return x + 1;
nuclear@15 259 }