dungeon_crawler: 938a6a155c94 prototype/src/renderer.cc

dungeon_crawler

view prototype/src/renderer.cc @ 30:938a6a155c94

foo

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 27 Aug 2012 04:03:22 +0300
parents	2fc004802739
children	0cd55268eaf4

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <string.h>

4 #include <limits.h>

5 #include <assert.h>

6 #include "opengl.h"

7 #include "renderer.h"

8 #include "level.h"

9 #include "sdr.h"

10 #include "datapath.h"

13 static bool create_fbo(int xsz, int ysz);

14 static unsigned int load_sdr(const char *vfname, const char *pfname);

15 static int round_pow2(int x);

18 #define MRT_COUNT 4

19 static unsigned int mrt_tex[MRT_COUNT];

21 static unsigned int mrt_prog;

22 static unsigned int deferred_omni, deferred_debug;

24 static unsigned int fbo, rbuf_depth;

25 static const char *fbstname[] = {

26 "GL_FRAMEBUFFER_COMPLETE",

27 "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT",

28 "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",

29 "no such fbo error",

30 "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS",

31 "GL_FRAMEBUFFER_INCOMPLETE_FORMATS",

32 "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER",

33 "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER",

34 "GL_FRAMEBUFFER_UNSUPPORTED"

35 };

37 static int fb_xsz, fb_ysz, tex_xsz, tex_ysz;

41 bool init_renderer(int xsz, int ysz)

42 {

43 if(!GLEW_ARB_draw_buffers) {

44 fprintf(stderr, "OpenGL implementation doesn't support multiple render targets\n");

45 return false;

46 }

48 int max_draw_buf;

49 glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_draw_buf);

50 printf("max draw buffers: %d\n", max_draw_buf);

51 if(max_draw_buf < MRT_COUNT) {

52 fprintf(stderr, "OpenGL implementation doesn't support enough draw buffers\n");

53 return false;

54 }

56 if(!create_fbo(xsz, ysz)) {

57 return false;

58 }

59 CHECKGLERR;

61 if(!(mrt_prog = load_sdr("mrt.v.glsl", "mrt.p.glsl"))) {

62 return false;

63 }

64 set_uniform_int(mrt_prog, "tex_dif", 0);

65 set_uniform_int(mrt_prog, "tex_norm", 1);

67 if(!(deferred_debug = load_sdr("deferred.v.glsl", "deferred.p.glsl"))) {

68 return false;

69 }

70 for(int i=0; i<MRT_COUNT; i++) {

71 char uname[32];

72 sprintf(uname, "mrt%d", i);

73 set_uniform_int(deferred_debug, uname, i);

74 }

76 if(!(deferred_omni = load_sdr("deferred_omni.v.glsl", "deferred_omni.p.glsl"))) {

77 return false;

78 }

79 for(int i=0; i<MRT_COUNT; i++) {

80 char uname[32];

81 sprintf(uname, "mrt%d", i);

82 set_uniform_int(deferred_omni, uname, i);

83 }

84 return true;

85 }

87 void destroy_renderer()

88 {

89 free_program(mrt_prog);

90 free_program(deferred_omni);

92 glDeleteTextures(MRT_COUNT, mrt_tex);

93 glDeleteFramebuffersEXT(1, &fbo);

94 }

96 void resize_renderer(int xsz, int ysz)

97 {

98 fb_xsz = xsz;

99 fb_ysz = ysz;

100

101 // if we need a bigger rendertarget resize all colorbuffer textures and the depth buffer

102 if(xsz > tex_xsz || ysz > tex_ysz) {

103 tex_xsz = round_pow2(xsz);

104 tex_ysz = round_pow2(ysz);

105

106 for(int i=0; i<MRT_COUNT; i++) {

107 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);

108 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_xsz, tex_ysz, 0, GL_RGBA,

109 GL_UNSIGNED_BYTE, 0);

110 }

111

112 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);

113 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);

114 }

115

116

117 // update the texture coordinate scaling factors

118 float tex_scale_x = (float)fb_xsz / tex_xsz;

119 float tex_scale_y = (float)fb_ysz / tex_ysz;

120

121 set_uniform_float2(deferred_omni, "tex_scale", tex_scale_x, tex_scale_y);

122 set_uniform_float2(deferred_omni, "fb_size", fb_xsz, fb_ysz);

123

124 set_uniform_float2(deferred_debug, "tex_scale", tex_scale_x, tex_scale_y);

125 }

126

127 void render_deferred(const Level *level)

128 {

129 // render into the MRT buffers

130 glUseProgram(mrt_prog);

131 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);

132

133 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

134 level->draw();

135

136 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);

137

138

139 // post-process lighting

140 glPushAttrib(GL_ENABLE_BIT);

141

142 glEnable(GL_BLEND);

143 glBlendFunc(GL_ONE, GL_ONE);

144

145 glDisable(GL_LIGHTING);

146 glDisable(GL_CULL_FACE);

147 glDisable(GL_DEPTH_TEST);

148

149 glUseProgram(deferred_omni);

150 for(int i=0; i<MRT_COUNT; i++) {

151 glActiveTexture(GL_TEXTURE0 + i);

152 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);

153 glEnable(GL_TEXTURE_2D);

154 }

155

156 glDepthMask(0);

157 level->draw_lights();

158 glDepthMask(1);

159

160 for(int i=0; i<MRT_COUNT; i++) {

161 glActiveTexture(GL_TEXTURE0 + MRT_COUNT - i - 1);

162 glDisable(GL_TEXTURE_2D);

163 }

164

165 glUseProgram(0);

166 glPopAttrib();

167 }

168

169 static bool create_fbo(int xsz, int ysz)

170 {

171 unsigned int clamp = GL_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;

172

173 tex_xsz = round_pow2(xsz);

174 tex_ysz = round_pow2(ysz);

175 fb_xsz = xsz;

176 fb_ysz = ysz;

177

178 if(!glGenFramebuffersEXT) {

179 fprintf(stderr, "FBO support missing\n");

180 return false;

181 }

182 glGenFramebuffersEXT(1, &fbo);

183 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);

184

185 glGenTextures(MRT_COUNT, mrt_tex);

186 for(int i=0; i<MRT_COUNT; i++) {

187 glBindTexture(GL_TEXTURE_2D, mrt_tex[i]);

188 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, clamp);

189 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, clamp);

190 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

191 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

192 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_xsz, tex_ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);

193

194 // attach to fbo

195 glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,

196 GL_TEXTURE_2D, mrt_tex[i], 0);

197 CHECKGLERR;

198 }

199

200 static GLenum draw_bufs[] = {

201 GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT,

202 GL_COLOR_ATTACHMENT2_EXT, GL_COLOR_ATTACHMENT3_EXT,

203 GL_COLOR_ATTACHMENT4_EXT, GL_COLOR_ATTACHMENT5_EXT,

204 GL_COLOR_ATTACHMENT6_EXT, GL_COLOR_ATTACHMENT7_EXT

205 };

206 glDrawBuffersARB(MRT_COUNT, draw_bufs);

207

208 glGenRenderbuffersEXT(1, &rbuf_depth);

209 glBindRenderbufferEXT(GL_RENDERBUFFER, rbuf_depth);

210 glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, tex_xsz, tex_ysz);

211 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rbuf_depth);

212

213 int fbst = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);

214 if(fbst != GL_FRAMEBUFFER_COMPLETE) {

215 fprintf(stderr, "incomplete fbo: %u (%s)\n", fbo, fbstname[fbst - GL_FRAMEBUFFER_COMPLETE]);

216 return false;

217 }

218 CHECKGLERR;

219

220 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);

221 return true;

222 }

223

224 static unsigned int load_sdr(const char *vfname, const char *pfname)

225 {

226 char vsfile[PATH_MAX], psfile[PATH_MAX];

227 const char *fname;

228 unsigned int prog;

229

230 if((fname = datafile_path(vfname))) {

231 strcpy(vsfile, fname);

232 } else {

233 vsfile[0] = 0;

234 }

235 if((fname = datafile_path(pfname))) {

236 strcpy(psfile, fname);

237 } else {

238 psfile[0] = 0;

239 }

240 if(!(prog = create_program_load(vsfile, psfile))) {

241 fprintf(stderr, "failed to load shader program (%s, %s)\n", vsfile, psfile);

242 return 0;

243 }

244 return prog;

245 }

246

247 static int round_pow2(int x)

248 {

249 x--;

250 x = (x >> 1) | x;

251 x = (x >> 2) | x;

252 x = (x >> 4) | x;

253 x = (x >> 8) | x;

254 x = (x >> 16) | x;

255 return x + 1;

256 }