Attached patch adds to glsl demos to mesa. If the drivers support
them, these might give better performance numbers than glxgears.
Currently both works fine with swrast, but neither works on i965.
Corresponding active bug reports:
https://bugs.freedesktop.org/show_bug.cgi?id=26691
https://bugs.freedesktop.org/show_bug.cgi?id=27060
Please apply!
Thanks,
Kristof
From 66bb9691509b5357d46439923f3191b87abd739b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?RALOVICH,=20Krist=C3=B3f?= <tad...@freemail.hu>
Date: Tue, 23 Mar 2010 21:48:15 -0400
Subject: [PATCH] demos: import GLSL raytracing demos
---
progs/glsl/Makefile | 4 +-
progs/glsl/fsraytrace.c | 385 +++++++++++++++++++++++++++++++++++++++++++++++
progs/glsl/vsraytrace.c | 363 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 751 insertions(+), 1 deletions(-)
create mode 100644 progs/glsl/fsraytrace.c
create mode 100644 progs/glsl/vsraytrace.c
diff --git a/progs/glsl/Makefile b/progs/glsl/Makefile
index 3b5a595..6030c80 100644
--- a/progs/glsl/Makefile
+++ b/progs/glsl/Makefile
@@ -26,6 +26,7 @@ PROG_SOURCES = \
convolutions.c \
deriv.c \
fragcoord.c \
+ fsraytrace.c \
identity.c \
linktest.c \
mandelbrot.c \
@@ -46,7 +47,8 @@ PROG_SOURCES = \
trirast.c \
twoside.c \
vert-or-frag-only.c \
- vert-tex.c
+ vert-tex.c \
+ vsraytrace.c
UTIL_HEADERS = \
extfuncs.h \
diff --git a/progs/glsl/fsraytrace.c b/progs/glsl/fsraytrace.c
new file mode 100644
index 0000000..dca8fd2
--- /dev/null
+++ b/progs/glsl/fsraytrace.c
@@ -0,0 +1,385 @@
+// -*- mode: c; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; coding: utf-8-unix -*-
+/*
+ Copyright (c) 2010 Kristóf 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"
+ "#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;
+}
+
diff --git a/progs/glsl/vsraytrace.c b/progs/glsl/vsraytrace.c
new file mode 100644
index 0000000..6e1617a
--- /dev/null
+++ b/progs/glsl/vsraytrace.c
@@ -0,0 +1,363 @@
+// -*- mode: c; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; coding: utf-8-unix -*-
+/*
+ Copyright (c) 2010 Kristóf 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 = 256, WinHeight = 256;
+static int WinWidth = 50, WinHeight = 50;
+static int mouseGrabbed = 0;
+
+static const char* vsSource =
+ "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"
+ "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"
+ "void main() \n"
+ "{ \n"
+ " const vec3 cameraPos = vec3(0,0,3); \n"
+ " const vec3 rayDir = normalize(vec3(gl_Vertex.x, gl_Vertex.y, -1.0) * rot);\n"
+ " Ray ray = Ray(cameraPos, rayDir); \n"
+ " gl_Position = gl_Vertex; \n"
+ " gl_FrontColor = trace1(ray); \n"
+ "} \n";
+
+static GLuint vertShader;
+static GLuint program;
+
+
+static void
+Draw(void)
+{
+ const float w = 0.5F * WinWidth;
+ const float h = 0.5F * WinHeight;
+ int x,y;
+
+ float rot[9] = {1,0,0, 0,1,0, 0,0,1};
+ GLint location = glGetUniformLocation(program, "rot");
+ //printf("loc=%d\n", location);
+
+ glUseProgram(program);
+ glUniformMatrix3fv(location, 1, 0, rot);
+ glBegin(GL_POINTS);
+ for(y = 0; y < WinHeight; y++)
+ {
+ for(x = 0; x < WinWidth; x++)
+ {
+ const float posx = x / w - 1.0F;
+ const float posy = y / h - 1.0F;
+ glVertex2f(posx, posy);
+ }
+ }
+ 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();
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+ if(key == 27)
+ {
+ glutDestroyWindow(Win);
+ exit(0);
+ }
+ glutPostRedisplay();
+}
+
+
+static
+void
+drag(int x, int y)
+{
+ if(mouseGrabbed)
+ {
+ printf("%4d %4d\n", x, y);
+ }
+}
+
+
+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);
+ program = LinkShaders(vertShader, 0);
+ 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);
+ glutIdleFunc(Draw);
+ glutMouseFunc(mouse);
+ glutMotionFunc(drag);
+ Init();
+ glutMainLoop();
+ return 0;
+}
+
--
1.7.0.2
------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
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proactively, and fine-tune applications for parallel performance.
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http://p.sf.net/sfu/intel-sw-dev
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