dungeon_crawler

annotate prototype/src/renderer.cc @ 34:85734f319626

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passing shininess and specular in mrt
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 28 Aug 2012 03:34:56 +0300
parents 0cd55268eaf4
children d0e93b4d9ec9
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@33 100 unsigned int get_deferred_shader(void)
nuclear@33 101 {
nuclear@33 102 return deferred_omni;
nuclear@33 103 }
nuclear@33 104
nuclear@23 105 void resize_renderer(int xsz, int ysz)
nuclear@17 106 {
nuclear@23 107 fb_xsz = xsz;
nuclear@23 108 fb_ysz = ysz;
nuclear@18 109
nuclear@23 110 // if we need a bigger rendertarget resize all colorbuffer textures and the depth buffer
nuclear@23 111 if(xsz > tex_xsz || ysz > tex_ysz) {
nuclear@23 112 tex_xsz = round_pow2(xsz);
nuclear@23 113 tex_ysz = round_pow2(ysz);
nuclear@23 114
nuclear@23 115 for(int i=0; i<MRT_COUNT; i++) {
nuclear@23 116 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
nuclear@32 117 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, tex_xsz, tex_ysz, 0, GL_RGBA, GL_FLOAT, 0);
nuclear@23 118 }
nuclear@23 119
nuclear@23 120 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);
nuclear@23 121 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@23 122 }
nuclear@23 123
nuclear@23 124
nuclear@23 125 // update the texture coordinate scaling factors
nuclear@23 126 float tex_scale_x = (float)fb_xsz / tex_xsz;
nuclear@23 127 float tex_scale_y = (float)fb_ysz / tex_ysz;
nuclear@23 128
nuclear@23 129 set_uniform_float2(deferred_omni, "tex_scale", tex_scale_x, tex_scale_y);
nuclear@30 130 set_uniform_float2(deferred_omni, "fb_size", fb_xsz, fb_ysz);
nuclear@30 131
nuclear@23 132 set_uniform_float2(deferred_debug, "tex_scale", tex_scale_x, tex_scale_y);
nuclear@23 133 }
nuclear@23 134
nuclear@23 135 void render_deferred(const Level *level)
nuclear@23 136 {
nuclear@18 137 // render into the MRT buffers
nuclear@23 138 glUseProgram(mrt_prog);
nuclear@18 139 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@19 140
nuclear@23 141 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@23 142 level->draw();
nuclear@20 143
nuclear@18 144 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@18 145
nuclear@18 146
nuclear@18 147 // post-process lighting
nuclear@33 148 glPushAttrib(GL_ENABLE_BIT | GL_POLYGON_BIT);
nuclear@18 149
nuclear@30 150 glEnable(GL_BLEND);
nuclear@30 151 glBlendFunc(GL_ONE, GL_ONE);
nuclear@30 152
nuclear@18 153 glDisable(GL_LIGHTING);
nuclear@30 154 glDisable(GL_DEPTH_TEST);
nuclear@33 155 glCullFace(GL_FRONT);
nuclear@18 156
nuclear@23 157 glUseProgram(deferred_omni);
nuclear@19 158 for(int i=0; i<MRT_COUNT; i++) {
nuclear@19 159 glActiveTexture(GL_TEXTURE0 + i);
nuclear@19 160 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
nuclear@19 161 glEnable(GL_TEXTURE_2D);
nuclear@18 162 }
nuclear@18 163
nuclear@23 164 glDepthMask(0);
nuclear@23 165 level->draw_lights();
nuclear@23 166 glDepthMask(1);
nuclear@18 167
nuclear@19 168 for(int i=0; i<MRT_COUNT; i++) {
nuclear@19 169 glActiveTexture(GL_TEXTURE0 + MRT_COUNT - i - 1);
nuclear@19 170 glDisable(GL_TEXTURE_2D);
nuclear@19 171 }
nuclear@19 172
nuclear@18 173 glUseProgram(0);
nuclear@18 174 glPopAttrib();
nuclear@17 175 }
nuclear@17 176
nuclear@17 177 static bool create_fbo(int xsz, int ysz)
nuclear@17 178 {
nuclear@17 179 unsigned int clamp = GL_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;
nuclear@17 180
nuclear@17 181 tex_xsz = round_pow2(xsz);
nuclear@17 182 tex_ysz = round_pow2(ysz);
nuclear@17 183 fb_xsz = xsz;
nuclear@17 184 fb_ysz = ysz;
nuclear@17 185
nuclear@17 186 if(!glGenFramebuffersEXT) {
nuclear@17 187 fprintf(stderr, "FBO support missing\n");
nuclear@17 188 return false;
nuclear@17 189 }
nuclear@17 190 glGenFramebuffersEXT(1, &fbo);
nuclear@18 191 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
nuclear@17 192
nuclear@17 193 glGenTextures(MRT_COUNT, mrt_tex);
nuclear@17 194 for(int i=0; i<MRT_COUNT; i++) {
nuclear@17 195 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);
nuclear@17 196 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, clamp);
nuclear@17 197 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, clamp);
nuclear@17 198 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@17 199 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@32 200 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, tex_xsz, tex_ysz, 0, GL_RGBA, GL_FLOAT, 0);
nuclear@17 201
nuclear@17 202 // attach to fbo
nuclear@20 203 glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
nuclear@20 204 GL_TEXTURE_2D, mrt_tex[i], 0);
nuclear@18 205 CHECKGLERR;
nuclear@17 206 }
nuclear@17 207
nuclear@20 208 static GLenum draw_bufs[] = {
nuclear@20 209 GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT,
nuclear@20 210 GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT,
nuclear@20 211 GL_COLOR_ATTACHMENT4_EXT, GL_COLOR_ATTACHMENT5_EXT,
nuclear@20 212 GL_COLOR_ATTACHMENT6_EXT, GL_COLOR_ATTACHMENT7_EXT
nuclear@20 213 };
nuclear@20 214 glDrawBuffersARB(MRT_COUNT, draw_bufs);
nuclear@20 215
nuclear@18 216 glGenRenderbuffersEXT(1, &rbuf_depth);
nuclear@18 217 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);
nuclear@18 218 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);
nuclear@18 219 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth);
nuclear@18 220
nuclear@17 221 int fbst = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
nuclear@17 222 if(fbst != GL_FRAMEBUFFER_COMPLETE) {
nuclear@17 223 fprintf(stderr, "incomplete fbo: %u (%s)\n", fbo, fbstname[fbst - GL_FRAMEBUFFER_COMPLETE]);
nuclear@17 224 return false;
nuclear@17 225 }
nuclear@18 226 CHECKGLERR;
nuclear@18 227
nuclear@18 228 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
nuclear@17 229 return true;
nuclear@17 230 }
nuclear@17 231
nuclear@18 232 static unsigned int load_sdr(const char *vfname, const char *pfname)
nuclear@15 233 {
nuclear@15 234 char vsfile[PATH_MAX], psfile[PATH_MAX];
nuclear@15 235 const char *fname;
nuclear@18 236 unsigned int prog;
nuclear@15 237
nuclear@18 238 if((fname = datafile_path(vfname))) {
nuclear@17 239 strcpy(vsfile, fname);
nuclear@17 240 } else {
nuclear@17 241 vsfile[0] = 0;
nuclear@17 242 }
nuclear@18 243 if((fname = datafile_path(pfname))) {
nuclear@17 244 strcpy(psfile, fname);
nuclear@17 245 } else {
nuclear@17 246 psfile[0] = 0;
nuclear@17 247 }
nuclear@18 248 if(!(prog = create_program_load(vsfile, psfile))) {
nuclear@18 249 fprintf(stderr, "failed to load shader program (%s, %s)\n", vsfile, psfile);
nuclear@18 250 return 0;
nuclear@15 251 }
nuclear@18 252 return prog;
nuclear@15 253 }
nuclear@15 254
nuclear@17 255 static int round_pow2(int x)
nuclear@15 256 {
nuclear@17 257 x--;
nuclear@17 258 x = (x >> 1) | x;
nuclear@17 259 x = (x >> 2) | x;
nuclear@17 260 x = (x >> 4) | x;
nuclear@17 261 x = (x >> 8) | x;
nuclear@17 262 x = (x >> 16) | x;
nuclear@17 263 return x + 1;
nuclear@15 264 }