Attachment 34030 Details for Bug 27060 – updated test case

updated test case

fsraytrace.c (text/plain), 17.04 KB, created by Kristof Ralovich on 2010-03-13 10:42:27 UTC

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Creator: Kristof Ralovich

Created: 2010-03-13 10:42:27 UTC

Size: 17.04 KB

patch

obsolete

>// -*- mode: c; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; coding: utf-8-unix -*-
>/*
>  Copyright (c) 2010 KristÃ³f Ralovich
>
>  Permission is hereby granted, free of charge, to any person obtaining a copy
>  of this software and associated documentation files (the "Software"), to deal
>  in the Software without restriction, including without limitation the rights
>  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
>  copies of the Software, and to permit persons to whom the Software is
>  furnished to do so, subject to the following conditions:
>
>  The above copyright notice and this permission notice shall be included in
>  all copies or substantial portions of the Software.
>
>  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
>  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
>  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
>  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
>  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
>  THE SOFTWARE.
>*/
>
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <GL/glew.h>
>#include <GL/glut.h>
>#include "shaderutil.h"
>
>
>static int Win;
>static int WinWidth = 512, WinHeight = 512;
>static GLfloat Xrot = 0, Yrot = 0;
>static int mouseGrabbed = 0;
>static GLuint vertShader;
>static GLuint fragShader;
>static GLuint program;
>
>static const char* vsSource =
>  "varying vec2 rayDir;\n"
>  "\n"
>  "void main()\n"
>  "{\n"
>  "  rayDir = gl_MultiTexCoord0.xy - vec2(0.5,0.5);\n"
>  "  gl_Position = gl_ProjectionMatrix * gl_Vertex;\n"
>  "}\n";
>
>static const char* fsSource =
>  "const float INF     = 9999.9;                                       \n"
>  "const float EPSILON = 0.00001;                                      \n"
>  "const vec3 lightPos = vec3(0.0, 8.0, 1.0);                          \n"
>  "const vec4 backgroundColor = vec4(0.2,0.3,0.4,1);                   \n"
>  "                                                                    \n"
>  "varying vec2 rayDir;                                                \n"
>  "                                                                    \n"
>  "uniform mat3 rot;                                                   \n"
>  "                                                                    \n"
>  "struct Ray                                                          \n"
>  "{                                                                   \n"
>  "vec3 orig;                                                          \n"
>  "vec3 dir;                                                           \n"
>  "};                                                                  \n"
>  "                                                                    \n"
>  "struct Sphere                                                       \n"
>  "{                                                                   \n"
>  "  vec3 c;                                                           \n"
>  "  float r;                                                          \n"
>  "};                                                                  \n"
>  "                                                                    \n"
>  "struct Isec                                                         \n"
>  "{                                                                   \n"
>  "  float t;                                                          \n"
>  "  int idx;                                                          \n"
>  "  vec3 hit;                                                         \n"
>  "  vec3 n;                                                           \n"
>  "};                                                                  \n"
>  "                                                                    \n"
>  "const Sphere spheres0 = Sphere( vec3(0.0,0.0,-1.0), 0.5 );          \n"
>  "const Sphere spheres1 = Sphere( vec3(-3.0,0.0,-1.0), 1.5 );         \n"
>  "const Sphere spheres2 = Sphere( vec3(0.0,3.0,-1.0), 0.5 );          \n"
>  "const Sphere spheres3 = Sphere( vec3(2.0,0.0,-1.0), 1.0 );          \n"
>  "                                                                    \n"
>  "// Mesa intel gen4 generates \"unsupported IR in fragment shader 13\" for\n"
>  "// sqrt, let's work around.                                         \n"
>  "float                                                               \n"
>  "sqrt_hack(float f2)                                                 \n"
>  "{                                                                   \n"
>  "  vec3 v = vec3(f2,0.0,0.0);                                        \n"
>  "  return length(v);                                                 \n"
>  "}                                                                   \n"
>  "                                                                    \n"
>  "void                                                                \n"
>  "intersect(const in Ray ray,                                         \n"
>  "          const in Sphere sph,                                      \n"
>  "          const in int idx,                                         \n"
>  "          inout Isec isec)                                          \n"
>  "{                                                                   \n"
>  "  // Project both o and the sphere to the plane perpendicular to d  \n"
>  "  // and containing c. Let x be the point where the ray intersects  \n"
>  "  // the plane. If |x-c| < r, the ray intersects the sphere.        \n"
>  "  vec3 o = ray.orig;                                                \n"
>  "  vec3 d = ray.dir;                                                 \n"
>  "  vec3 n = -d;                                                      \n"
>  "  vec3 c = sph.c;                                                   \n"
>  "  float r = sph.r;                                                  \n"
>  "  float t = dot(c-o,n)/dot(n,d);                                    \n"
>  "  vec3 x = o+d*t;                                                   \n"
>  "  float e = length(x-c);                                            \n"
>  "  if(e > r)                                                         \n"
>  "  {                                                                 \n"
>  "    // no intersection                                              \n"
>  "    return;                                                         \n"
>  "  }                                                                 \n"
>  "                                                                    \n"
>  "  // Apply Pythagorean theorem on the (intersection,x,c) triangle   \n"
>  "  // to get the distance between c and the intersection.            \n"
>  "#define BUGGY_INTEL_GEN4_GLSL 1                                     \n"
>  "#ifndef BUGGY_INTEL_GEN4_GLSL                                       \n"
>  "  float f = sqrt(r*r - e*e);                                        \n"
>  "#else                                                               \n"
>  "  float f = sqrt_hack(r*r - e*e);                                   \n"
>  "#endif                                                              \n"
>  "  float dist = t - f;                                               \n"
>  "  if(dist < 0.0)                                                    \n"
>  "  {                                                                 \n"
>  "    // inside the sphere                                            \n"
>  "    return;                                                         \n"
>  "  }                                                                 \n"
>  "                                                                    \n"
>  "  if(dist < EPSILON)                                                \n"
>  "    return;                                                         \n"
>  "                                                                    \n"
>  "  if(dist > isec.t)                                                 \n"
>  "    return;                                                         \n"
>  "                                                                    \n"
>  "  isec.t = dist;                                                    \n"
>  "  isec.idx = idx;                                                   \n"
>  "                                                                    \n"
>  "  isec.hit  = ray.orig + ray.dir * isec.t;                          \n"
>  "  isec.n = (isec.hit - c) / r;                                      \n"
>  "}                                                                   \n"
>  "                                                                    \n"
>  "Isec                                                                \n"
>  "intersect(const in Ray ray,                                         \n"
>  "          const in float max_t /*= INF*/)                           \n"
>  "{                                                                   \n"
>  "  Isec nearest;                                                     \n"
>  "  nearest.t = max_t;                                                \n"
>  "  nearest.idx = -1;                                                 \n"
>  "                                                                    \n"
>  "  intersect(ray, spheres0, 0, nearest);                             \n"
>  "  intersect(ray, spheres1, 1, nearest);                             \n"
>  "  intersect(ray, spheres2, 2, nearest);                             \n"
>  "  intersect(ray, spheres3, 3, nearest);                             \n"
>  "                                                                    \n"
>  "  return nearest;                                                   \n"
>  "}                                                                   \n"
>  "                                                                    \n"
>  "vec4                                                                \n"
>  "idx2color(const in int idx)                                         \n"
>  "{                                                                   \n"
>  "  vec4 diff;                                                        \n"
>  "  if(idx == 0)                                                      \n"
>  "    diff = vec4(1.0, 0.0, 0.0, 0.0);                                \n"
>  "  else if(idx == 1)                                                 \n"
>  "    diff = vec4(0.0, 1.0, 0.0, 0.0);                                \n"
>  "  else if(idx == 2)                                                 \n"
>  "    diff = vec4(0.0, 0.0, 1.0, 0.0);                                \n"
>  "  else if(idx == 3)                                                 \n"
>  "    diff = vec4(1.0, 1.0, 0.0, 0.0);                                \n"
>  "  return diff;                                                      \n"
>  "}                                                                   \n"
>  "                                                                    \n"
>  "vec4                                                                \n"
>  "trace0(const in Ray ray)                                            \n"
>  "{                                                                   \n"
>  "  Isec isec = intersect(ray, INF);                                  \n"
>  "                                                                    \n"
>  "  if(isec.idx == -1)                                                \n"
>  "  {                                                                 \n"
>  "    return backgroundColor;                                         \n"
>  "  }                                                                 \n"
>  "                                                                    \n"
>  "  vec4 diff = idx2color(isec.idx);                                  \n"
>  "                                                                    \n"
>  "  vec3 N = isec.n;                                                  \n"
>  "  vec3 L = normalize(lightPos-isec.hit);                            \n"
>  "  vec3 camera_dir = normalize(ray.orig - isec.hit);                 \n"
>  "  return dot(N,L)*diff + pow(                                       \n"
>  "    clamp(dot(reflect(-L,N),camera_dir),0.0,1.0),16.0);             \n"
>  "}                                                                   \n"
>  "                                                                    \n"
>  "vec4                                                                \n"
>  "trace1(const in Ray ray)                                            \n"
>  "{                                                                   \n"
>  "  Isec isec = intersect(ray, INF);                                  \n"
>  "                                                                    \n"
>  "  if(isec.idx == -1)                                                \n"
>  "  {                                                                 \n"
>  "    return backgroundColor;                                         \n"
>  "  }                                                                 \n"
>  "                                                                    \n"
>  "  Ray reflRay = Ray(isec.hit, reflect(ray.dir, isec.n));            \n"
>  "                                                                    \n"
>  "  vec4 reflCol = trace0(reflRay);                                   \n"
>  "                                                                    \n"
>  "  vec4 diff = idx2color(isec.idx) + reflCol;                        \n"
>  "                                                                    \n"
>  "  vec3 N = isec.n;                                                  \n"
>  "  vec3 L = normalize(lightPos-isec.hit);                            \n"
>  "  vec3 camera_dir = normalize(ray.orig - isec.hit);                 \n"
>  "  return dot(N,L)*diff + pow(                                       \n"
>  "    clamp(dot(reflect(-L,N),camera_dir),0.0,1.0),16.0);             \n"
>  "}                                                                   \n"
>  "                                                                    \n"
>  "\n"
>  "void\n"
>  "main()\n"
>  "{\n"
>  "  const float z = -0.5;\n"
>  "  const vec3 cameraPos = vec3(0,0,3);                               \n"
>  "  Ray r = Ray(cameraPos, normalize(vec3(rayDir, z) * rot));\n"
>  "  gl_FragColor = trace1(r);\n"
>  "}\n";
>
>
>
>static void
>Idle(void)
>{
>  glutPostRedisplay();
>}
>
>
>static void
>Draw(void)
>{
>  float rot[9] = {1,0,0,  0,1,0,   0,0,1};
>  GLint location = glGetUniformLocation(program, "rot");
>
>  glUseProgram(program);
>  glUniformMatrix3fv(location, 1, 0, rot);
>  static const float m = -10.F;
>  static const float p =  10.F;
>  static const float d = -0.5F;
>  glBegin(GL_QUADS);
>  {
>    glTexCoord2f(0.0F, 0.0F); glVertex3f(m, m, d);
>    glTexCoord2f(1.0F, 0.0F); glVertex3f(p, m, d);
>    glTexCoord2f(1.0F, 1.0F); glVertex3f(p, p, d);
>    glTexCoord2f(0.0F, 1.0F); glVertex3f(m, p, d);
>  }
>  glEnd();
>  glUseProgram(0);
>
>  glutSwapBuffers();
>
>  static int frames = 0;
>  static int t0 = 0;
>  static int t1 = 0;
>  frames++;
>  t1 = glutGet(GLUT_ELAPSED_TIME);
>  float dt = (float)(t1-t0)/1000.0F;
>  if(dt >= 5.0F)
>  {
>    float fps = (float)frames / dt;
>    printf("%f FPS (%d frames in %f seconds)\n", fps, frames, dt);
>    frames = 0;
>    t0 = t1;
>  }
>}
>
>
>static void
>Reshape(int width, int height)
>{
>  WinWidth = width;
>  WinHeight = height;
>  glViewport(0, 0, width, height);
>  glMatrixMode(GL_PROJECTION);
>  glLoadIdentity();
>  glOrtho(-10, 10, -10, 10, -1, 1);
>  glMatrixMode(GL_MODELVIEW);
>  glLoadIdentity();
>}
>
>
>static void
>Key(unsigned char key, int x, int y)
>{
>  (void) x;
>  (void) y;
>  switch (key) {
>  case 27:
>    glutDestroyWindow(Win);
>    exit(0);
>    break;
>  }
>  glutPostRedisplay();
>}
>
>
>static
>void
>drag(int x, int y)
>{
>  float scale = 1.5F;
>  if(mouseGrabbed)
>  {
>    Xrot = (float)(x - WinWidth/2) / scale;
>    Yrot = (float)(y - WinHeight/2) / scale;
>    printf("%4.2f %4.2f\n", Xrot, Yrot);
>  }
>}
>
>
>static
>void
>mouse(int button, int state, int x, int y)
>{
>  if(state == GLUT_DOWN)
>  {
>    mouseGrabbed = !mouseGrabbed;
>  }
>}
>
>
>static void
>Init(void)
>{
>  glDisable(GL_DEPTH_TEST);
>
>  if(!ShadersSupported())
>  {
>    fprintf(stderr, "Shaders are not supported!\n");
>    exit(-1);
>  }
>
>  vertShader = CompileShaderText(GL_VERTEX_SHADER, vsSource);
>  fragShader = CompileShaderText(GL_FRAGMENT_SHADER, fsSource);
>  program = LinkShaders(vertShader, fragShader);
>  glUseProgram(0);
>
>  if(glGetError() != 0)
>  {
>    fprintf(stderr, "Shaders were not loaded!\n");
>    exit(-1);
>  }
>
>  if(!glIsShader(vertShader))
>  {
>    fprintf(stderr, "Vertex shader failed!\n");
>    exit(-1);
>  }
>
>  if(!glIsProgram(program))
>  {
>    fprintf(stderr, "Shader program failed!\n");
>    exit(-1);
>  }
>
>  printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER));
>}
>
>
>int
>main(int argc, char *argv[])
>{
>  /*setenv("LIBGL_ALWAYS_SOFTWARE", "1", 1);*/
>  glutInit(&argc, argv);
>  glutInitWindowSize(WinWidth, WinHeight);
>  glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
>  Win = glutCreateWindow(argv[0]);
>  glewInit();
>  glutReshapeFunc(Reshape);
>  glutKeyboardFunc(Key);
>  glutDisplayFunc(Draw);
>  glutMouseFunc(mouse);
>  glutPassiveMotionFunc(drag);
>  glutIdleFunc(Idle);
>  Init();
>  glutMainLoop();
>  return 0;
>}
>

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Attachments on bug 27060: 34029 | 34030

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