| /** |
| * Measure fill rates for basic shading/texturing modes. |
| * |
| * Brian Paul |
| * 1 April 2008 |
| */ |
| |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #include <GL/glew.h> |
| #include <GL/glut.h> |
| #include "readtex.h" |
| |
| #define TEXTURE_1_FILE "../images/tile.rgb" |
| #define TEXTURE_2_FILE "../images/reflect.rgb" |
| |
| static int Win; |
| static int Width = 1010, Height = 1010; |
| static GLuint Textures[2]; |
| |
| |
| /** |
| * Draw quad 10 pixels shorter, narrower than window size. |
| */ |
| static void |
| DrawQuad(void) |
| { |
| glBegin(GL_POLYGON); |
| |
| glColor3f(1.0, 0.5, 0.5); |
| glMultiTexCoord2f(GL_TEXTURE0, 0, 0); |
| glMultiTexCoord2f(GL_TEXTURE1, 0, 0); |
| glVertex2f(5, 5); |
| |
| glColor3f(0.5, 1.0, 0.5); |
| glMultiTexCoord2f(GL_TEXTURE0, 1, 0); |
| glMultiTexCoord2f(GL_TEXTURE1, 1, 0); |
| glVertex2f(Width - 5, 5); |
| |
| glColor3f(0.5, 0.5, 1.0); |
| glMultiTexCoord2f(GL_TEXTURE0, 1, 1); |
| glMultiTexCoord2f(GL_TEXTURE1, 1, 1); |
| glVertex2f(Width - 5, Height - 5); |
| |
| glColor3f(1.0, 0.5, 1.0); |
| glMultiTexCoord2f(GL_TEXTURE0, 0, 1); |
| glMultiTexCoord2f(GL_TEXTURE1, 0, 1); |
| glVertex2f(5, Height - 5); |
| |
| glEnd(); |
| } |
| |
| |
| /** |
| * Compute rate for drawing large quad with given shading/texture state. |
| */ |
| static void |
| RunTest(GLenum shading, GLuint numTextures, GLenum texFilter) |
| { |
| const GLdouble minPeriod = 2.0; |
| GLdouble t0, t1; |
| GLdouble pixels, rate; |
| GLint i, iters; |
| |
| glActiveTexture(GL_TEXTURE0); |
| if (numTextures > 0) { |
| glBindTexture(GL_TEXTURE_2D, Textures[0]); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, texFilter); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, texFilter); |
| glEnable(GL_TEXTURE_2D); |
| } |
| else { |
| glDisable(GL_TEXTURE_2D); |
| } |
| |
| glActiveTexture(GL_TEXTURE1); |
| if (numTextures > 1) { |
| glBindTexture(GL_TEXTURE_2D, Textures[1]); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, texFilter); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, texFilter); |
| glEnable(GL_TEXTURE_2D); |
| } |
| else { |
| glDisable(GL_TEXTURE_2D); |
| } |
| |
| glShadeModel(shading); |
| |
| |
| glFinish(); |
| |
| iters = 1; |
| do { |
| iters *= 4; |
| t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001; |
| for (i = 0; i < iters; i++) { |
| DrawQuad(); |
| } |
| glFinish(); |
| t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001; |
| } while (t1 - t0 < minPeriod); |
| |
| glutSwapBuffers(); |
| |
| pixels = (double) iters * (Width - 10) * (Height - 10); |
| rate = pixels / (t1 - t0); |
| rate /= 1000000.0; /* megapixels/second */ |
| |
| printf("%s ", shading == GL_FLAT ? "GL_FLAT" : "GL_SMOOTH"); |
| printf("Textures=%u ", numTextures); |
| printf("Filter=%s: ", texFilter == GL_LINEAR ? "GL_LINEAR" : "GL_NEAREST"); |
| printf("%g MPixels/sec\n", rate); |
| } |
| |
| |
| static void |
| Draw(void) |
| { |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| RunTest(GL_FLAT, 0, GL_NEAREST); |
| RunTest(GL_SMOOTH, 0, GL_NEAREST); |
| RunTest(GL_SMOOTH, 1, GL_NEAREST); |
| RunTest(GL_SMOOTH, 1, GL_LINEAR); |
| RunTest(GL_SMOOTH, 2, GL_NEAREST); |
| RunTest(GL_SMOOTH, 2, GL_LINEAR); |
| |
| glutSwapBuffers(); |
| } |
| |
| |
| static void |
| Reshape(int width, int height) |
| { |
| glViewport(0, 0, width, height); |
| glMatrixMode(GL_PROJECTION); |
| glLoadIdentity(); |
| glOrtho(0, width, 0, height, -1, 1); |
| glMatrixMode(GL_MODELVIEW); |
| glLoadIdentity(); |
| Width = width; |
| Height = height; |
| } |
| |
| |
| 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 |
| Init(void) |
| { |
| printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); |
| |
| glGenTextures(2, Textures); |
| |
| glBindTexture(GL_TEXTURE_2D, Textures[0]); |
| glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |
| |
| if (!LoadRGBMipmaps(TEXTURE_1_FILE, GL_RGB)) { |
| printf("Error: couldn't load texture image\n"); |
| exit(1); |
| } |
| |
| glBindTexture(GL_TEXTURE_2D, Textures[1]); |
| glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |
| |
| if (!LoadRGBMipmaps(TEXTURE_2_FILE, GL_RGB)) { |
| printf("Error: couldn't load texture image\n"); |
| exit(1); |
| } |
| |
| } |
| |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| glutInit(&argc, argv); |
| glutInitWindowPosition(0, 0); |
| glutInitWindowSize(Width, Height); |
| glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); |
| Win = glutCreateWindow(argv[0]); |
| glewInit(); |
| glutReshapeFunc(Reshape); |
| glutKeyboardFunc(Key); |
| glutDisplayFunc(Draw); |
| Init(); |
| glutMainLoop(); |
| return 0; |
| } |