clray: 6c44e4b1726d src/rt.cc

clray

view src/rt.cc @ 22:6c44e4b1726d

OMG alignment is a bitch

author	John Tsiombikas <nuclear@member.fsf.org>
date	Wed, 11 Aug 2010 04:30:35 +0100
parents	bd6c2b25f6e7
children	13091c00d7ca

line source

1 #include <stdio.h>

2 #include <string.h>

3 #include <math.h>

4 #include <assert.h>

5 #include "ogl.h"

6 #include "ocl.h"

7 #include "scene.h"

9 // kernel arguments

10 enum {

11 KARG_FRAMEBUFFER,

12 KARG_RENDER_INFO,

13 KARG_FACES,

14 KARG_MATLIB,

15 KARG_LIGHTS,

16 KARG_PRIM_RAYS,

17 KARG_XFORM,

18 KARG_INVTRANS_XFORM,

20 NUM_KERNEL_ARGS

21 };

23 struct RendInfo {

24 float ambient[4];

25 int xsz, ysz;

26 int num_faces, num_lights;

27 int max_iter;

28 };

30 struct Ray {

31 float origin[4], dir[4];

32 };

34 struct Light {

35 float pos[4], color[4];

36 };

38 static Ray get_primary_ray(int x, int y, int w, int h, float vfov_deg);

39 static Face *create_face_buffer(Mesh **meshes, int num_meshes);

41 static Face *faces;

42 static Ray *prim_rays;

43 static CLProgram *prog;

44 static int global_size;

46 static Light lightlist[] = {

47 {{-8, 15, 18, 0}, {1, 1, 1, 1}}

48 };

51 static RendInfo rinf;

54 bool init_renderer(int xsz, int ysz, Scene *scn)

55 {

56 // render info

57 rinf.ambient[0] = rinf.ambient[1] = rinf.ambient[2] = 0.0;

58 rinf.ambient[3] = 0.0;

60 rinf.xsz = xsz;

61 rinf.ysz = ysz;

62 rinf.num_faces = scn->get_num_faces();

63 rinf.num_lights = sizeof lightlist / sizeof *lightlist;

64 rinf.max_iter = 6;

66 /* calculate primary rays */

67 prim_rays = new Ray[xsz * ysz];

69 for(int i=0; i<ysz; i++) {

70 for(int j=0; j<xsz; j++) {

71 prim_rays[i * xsz + j] = get_primary_ray(j, i, xsz, ysz, 45.0);

72 }

73 }

75 /* setup opencl */

76 prog = new CLProgram("render");

77 if(!prog->load("rt.cl")) {

78 return false;

79 }

81 /*Face **/faces = create_face_buffer(&scn->meshes[0], scn->meshes.size());

82 if(!faces) {

83 fprintf(stderr, "failed to create face buffer\n");

84 return false;

85 }

87 /* setup argument buffers */

88 prog->set_arg_buffer(KARG_FRAMEBUFFER, ARG_WR, xsz * ysz * 4 * sizeof(float));

89 prog->set_arg_buffer(KARG_RENDER_INFO, ARG_RD, sizeof rinf, &rinf);

90 prog->set_arg_buffer(KARG_FACES, ARG_RD, rinf.num_faces * sizeof(Face), faces);

91 prog->set_arg_buffer(KARG_MATLIB, ARG_RD, scn->get_num_materials() * sizeof(Material), scn->get_materials());

92 prog->set_arg_buffer(KARG_LIGHTS, ARG_RD, sizeof lightlist, lightlist);

93 prog->set_arg_buffer(KARG_PRIM_RAYS, ARG_RD, xsz * ysz * sizeof *prim_rays, prim_rays);

94 prog->set_arg_buffer(KARG_XFORM, ARG_RD, 16 * sizeof(float));

95 prog->set_arg_buffer(KARG_INVTRANS_XFORM, ARG_RD, 16 * sizeof(float));

97 if(prog->get_num_args() < NUM_KERNEL_ARGS) {

98 return false;

99 }

100

101 if(!prog->build()) {

102 return false;

103 }

104

105 delete [] prim_rays;

106

107 global_size = xsz * ysz;

108 return true;

109 }

110

111 void destroy_renderer()

112 {

113 delete prog;

114 }

115

116 bool render()

117 {

118 if(!prog->run(1, global_size)) {

119 return false;

120 }

121

122 CLMemBuffer *mbuf = prog->get_arg_buffer(KARG_FRAMEBUFFER);

123 void *fb = map_mem_buffer(mbuf, MAP_RD);

124 if(!fb) {

125 fprintf(stderr, "FAILED\n");

126 return false;

127 }

128

129 static int foo = 0;

130 if(!foo++) {

131 bool write_ppm(const char *fname, float *fb, int xsz, int ysz);

132 write_ppm("foo.ppm", (float*)fb, rinf.xsz, rinf.ysz);

133 }

134

135 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rinf.xsz, rinf.ysz, GL_RGBA, GL_FLOAT, fb);

136 unmap_mem_buffer(mbuf);

137 return true;

138 }

139

140 static void dbg_set_gl_material(Material *mat)

141 {

142 static Material def_mat = {{0.7, 0.7, 0.7, 1}, {0, 0, 0, 0}, 0, 0, 0};

143

144 if(!mat) mat = &def_mat;

145

146 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat->kd);

147 glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat->ks);

148 glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, mat->spow);

149 }

150

151 void dbg_render_gl(Scene *scn)

152 {

153 glPushAttrib(GL_ENABLE_BIT | GL_TRANSFORM_BIT | GL_LIGHTING_BIT);

154

155 for(int i=0; i<rinf.num_lights; i++) {

156 float lpos[4];

157

158 memcpy(lpos, lightlist[i].pos, sizeof lpos);

159 lpos[3] = 1.0;

160

161 glLightfv(GL_LIGHT0 + i, GL_POSITION, lpos);

162 glLightfv(GL_LIGHT0 + i, GL_DIFFUSE, lightlist[i].color);

163 glEnable(GL_LIGHT0 + i);

164 }

165

166 glDisable(GL_TEXTURE_2D);

167 glEnable(GL_DEPTH_TEST);

168 glEnable(GL_LIGHTING);

169

170 glMatrixMode(GL_PROJECTION);

171 glPushMatrix();

172 glLoadIdentity();

173 gluPerspective(45.0, (float)rinf.xsz / (float)rinf.ysz, 0.5, 1000.0);

174

175 Material *materials = scn->get_materials();

176

177 int num_faces = scn->get_num_faces();

178 int cur_mat = -1;

179

180 for(int i=0; i<num_faces; i++) {

181 if(faces[i].matid != cur_mat) {

182 if(cur_mat != -1) {

183 glEnd();

184 }

185 dbg_set_gl_material(materials ? materials + faces[i].matid : 0);

186 cur_mat = faces[i].matid;

187 glBegin(GL_TRIANGLES);

188 }

189

190 for(int j=0; j<3; j++) {

191 glNormal3fv(faces[i].v[j].normal);

192 glVertex3fv(faces[i].v[j].pos);

193 }

194 }

195 glEnd();

196

197 glPopMatrix();

198 glPopAttrib();

199

200 assert(glGetError() == GL_NO_ERROR);

201 }

202

203 void set_xform(float *matrix, float *invtrans)

204 {

205 CLMemBuffer *mbuf_xform = prog->get_arg_buffer(KARG_XFORM);

206 CLMemBuffer *mbuf_invtrans = prog->get_arg_buffer(KARG_INVTRANS_XFORM);

207 assert(mbuf_xform && mbuf_invtrans);

208

209 float *mem = (float*)map_mem_buffer(mbuf_xform, MAP_WR);

210 memcpy(mem, matrix, 16 * sizeof *mem);

211 unmap_mem_buffer(mbuf_xform);

212

213 mem = (float*)map_mem_buffer(mbuf_invtrans, MAP_WR);

214 memcpy(mem, invtrans, 16 * sizeof *mem);

215 unmap_mem_buffer(mbuf_invtrans);

216 }

217

218 static Ray get_primary_ray(int x, int y, int w, int h, float vfov_deg)

219 {

220 float vfov = M_PI * vfov_deg / 180.0;

221 float aspect = (float)w / (float)h;

222

223 float ysz = 2.0;

224 float xsz = aspect * ysz;

225

226 float px = ((float)x / (float)w) * xsz - xsz / 2.0;

227 float py = 1.0 - ((float)y / (float)h) * ysz;

228 float pz = 1.0 / tan(0.5 * vfov);

229

230 px *= 100.0;

231 py *= 100.0;

232 pz *= 100.0;

233

234 Ray ray = {{0, 0, 0, 1}, {px, py, -pz, 1}};

235 return ray;

236 }

237

238 static Face *create_face_buffer(Mesh **meshes, int num_meshes)

239 {

240 int num_faces = 0;

241 for(int i=0; i<num_meshes; i++) {

242 num_faces += meshes[i]->faces.size();

243 }

244 printf("constructing face buffer with %d faces (out of %d meshes)\n", num_faces, num_meshes);

245

246 Face *faces = new Face[num_faces];

247 memset(faces, 0, num_faces * sizeof *faces);

248 Face *fptr = faces;

249

250 for(int i=0; i<num_meshes; i++) {

251 for(size_t j=0; j<meshes[i]->faces.size(); j++) {

252 *fptr++ = meshes[i]->faces[j];

253 }

254 }

255 return faces;

256 }