dungeon_crawler: d89b403f630b prototype/src/renderer.cc

dungeon_crawler

view prototype/src/renderer.cc @ 77:d89b403f630b

added gamma correction (without dialing the lighting down yet) fixed the incorrect PointLight sphere radius

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 26 Oct 2012 03:03:52 +0300
parents	67d330038629
children	12a1dcfe91fa

line source

1 #include <limits.h>

2 #include "opengl.h"

3 #include "renderer.h"

4 #include "level.h"

5 #include "sdr.h"

6 #include "datapath.h"

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

9 static int round_pow2(int x);

11 Renderer *rend;

14 Renderer::Renderer()

15 {

16 fbo = 0;

17 rend_tex = rend_depth = 0;

18 width = height = 0;

19 tex_xsz = tex_ysz = 0;

20 post_sdr = 0;

21 }

23 Renderer::~Renderer()

24 {

25 if(post_sdr) {

26 free_program(post_sdr);

27 }

28 if(rend_tex) {

29 glDeleteTextures(1, &rend_tex);

30 }

31 if(rend_depth) {

32 glDeleteRenderbuffersEXT(1, &rend_depth);

33 }

34 if(fbo) {

35 glDeleteFramebuffersEXT(1, &fbo);

36 }

37 }

39 bool Renderer::init(int xsz, int ysz)

40 {

41 width = xsz;

42 height = ysz;

44 if(!create_rtarg()) {

45 return false;

46 }

48 if(!(post_sdr = load_sdr("post.v.glsl", "post.p.glsl"))) {

49 return false;

50 }

52 if(!gradepal.create()) {

53 return false;

54 }

56 rend = this;

57 return true;

58 }

60 int Renderer::get_tangent_location() const

61 {

62 return -1;

63 }

65 unsigned int Renderer::get_current_program() const

66 {

67 return 0;

68 }

70 void Renderer::resize(int xsz, int ysz)

71 {

72 width = xsz;

73 height = ysz;

75 // if we need a bigger rendertarget ...

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

77 tex_xsz = round_pow2(xsz);

78 tex_ysz = round_pow2(ysz);

80 // ... resize the render target

81 glBindTexture(GL_TEXTURE_2D, rend_tex);

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

84 // ... resize the depth buffer

85 glBindRenderbufferEXT(GL_RENDERBUFFER, rend_depth);

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

87 }

88 }

90 void Renderer::render_pre(const Level *level) const

91 {

92 glEnable(GL_FOG);

93 glFogi(GL_FOG_MODE, GL_LINEAR);

94 glFogf(GL_FOG_START, 3.0f);

95 glFogf(GL_FOG_END, 6.0f);

96 // TODO level->draw_pre();

98 // bind the render target

99 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);

100 glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rend_tex, 0);

101 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

102

103 CHECKGLERR;

104 }

105

106 void Renderer::render_post(const Level *level) const

107 {

108 level->draw_post();

109 CHECKGLERR;

110

111 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);

112

113 // draw the rendered output

114 glActiveTextureARB(GL_TEXTURE0);

115 glBindTexture(GL_TEXTURE_2D, rend_tex);

116 glEnable(GL_TEXTURE_2D);

117

118 // use the color-grading palette

119 glActiveTextureARB(GL_TEXTURE1);

120 glBindTexture(GL_TEXTURE_3D, gradepal.get_texture());

121 glEnable(GL_TEXTURE_3D);

122

123 glUseProgram(post_sdr);

124 set_uniform_int(post_sdr, "fbtex", 0);

125 set_uniform_int(post_sdr, "paltex", 1);

126

127 glBegin(GL_QUADS);

128 glTexCoord2f(0, 0);

129 glVertex2f(-1, -1);

130 glTexCoord2f((float)width / tex_xsz, 0);

131 glVertex2f(1, -1);

132 glTexCoord2f((float)width / tex_xsz, (float)height / tex_ysz);

133 glVertex2f(1, 1);

134 glTexCoord2f(0, (float)height / tex_ysz);

135 glVertex2f(-1, 1);

136 glEnd();

137 glUseProgram(0);

138

139 glActiveTextureARB(GL_TEXTURE1);

140 glDisable(GL_TEXTURE_3D);

141 glActiveTextureARB(GL_TEXTURE0);

142 glDisable(GL_TEXTURE_2D);

143

144 CHECKGLERR;

145 }

146

147 static const char *fbstname[] = {

148 "GL_FRAMEBUFFER_COMPLETE",

149 "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT",

150 "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT",

151 "no such fbo error",

152 "GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS",

153 "GL_FRAMEBUFFER_INCOMPLETE_FORMATS",

154 "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER",

155 "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER",

156 "GL_FRAMEBUFFER_UNSUPPORTED"

157 };

158

159 bool Renderer::create_rtarg()

160 {

161 unsigned int clamp = GLEW_ARB_texture_border_clamp ? GL_CLAMP_TO_EDGE : GL_CLAMP;

162

163 tex_xsz = round_pow2(width);

164 tex_ysz = round_pow2(height);

165

166 if(!glGenFramebuffersEXT) {

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

168 return false;

169 }

170 glGenFramebuffersEXT(1, &fbo);

171 glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);

172

173 // create the render target

174 glGenTextures(1, &rend_tex);

175 glBindTexture(GL_TEXTURE_2D, rend_tex);

176 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, clamp);

177 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, clamp);

178 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

179 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

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

181

182 glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rend_tex, 0);

183

184 // create depth buffer

185 glGenRenderbuffersEXT(1, &rend_depth);

186 glBindRenderbufferEXT(GL_RENDERBUFFER, rend_depth);

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

188

189 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rend_depth);

190

191 int fbst = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);

192 if(fbst != GL_FRAMEBUFFER_COMPLETE) {

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

194 return false;

195 }

196 CHECKGLERR;

197

198 glBindFramebufferEXT(GL_FRAMEBUFFER, 0);

199 return true;

200 }

201

202 GradePalette *Renderer::get_grade_palette()

203 {

204 return &gradepal;

205 }

206

207 const GradePalette *Renderer::get_grade_palette() const

208 {

209 return &gradepal;

210 }

211

212

213 // ---- fallback forward renderer ----

214 FwdRenderer::FwdRenderer()

215 {

216 sdrprog = 0;

217 tang_attr = -1;

218 }

219

220 FwdRenderer::~FwdRenderer()

221 {

222 if(sdrprog) {

223 free_program(sdrprog);

224 }

225 }

226

227 bool FwdRenderer::init(int xsz, int ysz)

228 {

229 if(!Renderer::init(xsz, ysz)) {

230 return false;

231 }

232

233 if(glUseProgram && (sdrprog = load_sdr("fallback.v.glsl", "fallback.p.glsl"))) {

234 tang_attr = get_attrib_loc(sdrprog, "attr_tangent");

235 set_uniform_int(sdrprog, "tex_dif", 0);

236 set_uniform_int(sdrprog, "tex_norm", 1);

237 }

238 return true;

239 }

240

241 int FwdRenderer::get_tangent_location() const

242 {

243 return tang_attr;

244 }

245

246 unsigned int FwdRenderer::get_current_program() const

247 {

248 return sdrprog;

249 }

250

251 void FwdRenderer::render(const Level *level) const

252 {

253 glPushAttrib(GL_ENABLE_BIT);

254 glEnable(GL_LIGHTING);

255

256 render_pre(level);

257

258 glUseProgram(sdrprog);

259 level->draw();

260 glUseProgram(0);

261

262 render_post(level);

263

264 glPopAttrib();

265 }

266

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

268 {

269 unsigned int prog;

270

271 std::string vsfile = datafile_path(vfname);

272 std::string psfile = datafile_path(pfname);

273

274 const char *vs = vsfile.empty() ? 0 : vsfile.c_str();

275 const char *ps = psfile.empty() ? 0 : psfile.c_str();

276

277 if(!(prog = create_program_load(vs, ps))) {

278 fprintf(stderr, "failed to load shader program (%s, %s)\n", vs, ps);

279 return 0;

280 }

281 return prog;

282 }

283

284 static int round_pow2(int x)

285 {

286 x--;

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

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

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

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

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

292 return x + 1;

293 }

294