--- /dev/null
+/*
+ * Measure glTexSubImage and glCopyTexSubImage speed
+ *
+ * Brian Paul
+ * 26 Jan 2006
+ */
+
+#define GL_GLEXT_PROTOTYPES
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <GL/glut.h>
+
+static GLint WinWidth = 1024, WinHeight = 512;
+static GLint TexWidth = 512, TexHeight = 512;
+
+static GLuint TexObj = 1;
+
+static GLenum IntFormat = GL_RGBA8;
+static GLenum ReadFormat = GL_RGBA; /* for glReadPixels */
+
+static GLboolean DrawQuad = GL_TRUE;
+
+
+/**
+ * draw teapot image, size TexWidth by TexHeight
+ */
+static void
+DrawTestImage(void)
+{
+ GLfloat ar;
+
+ glViewport(0, 0, TexWidth, TexHeight);
+ glScissor(0, 0, TexWidth, TexHeight);
+ glEnable(GL_SCISSOR_TEST);
+
+ glClearColor(0.5, 0.5, 0.5, 0.0);
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ ar = (float) TexWidth / TexHeight;
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-ar, ar, -1.0, 1.0, 5.0, 25.0);
+ glMatrixMode(GL_MODELVIEW);
+
+ glEnable(GL_LIGHTING);
+ glEnable(GL_LIGHT0);
+ glEnable(GL_DEPTH_TEST);
+ glFrontFace(GL_CW);
+ glPushMatrix();
+ glRotatef(45, 1, 0, 0);
+ glRotatef(45, 0, 1, 0);
+ glutSolidTeapot(2.3);
+ glPopMatrix();
+ glFrontFace(GL_CCW);
+ glDisable(GL_DEPTH_TEST);
+ glDisable(GL_LIGHTING);
+
+ glDisable(GL_SCISSOR_TEST);
+
+ glViewport(0, 0, WinWidth, WinHeight);
+ glFinish();
+}
+
+
+/**
+ * Do glCopyTexSubImage2D call (update texture with framebuffer data)
+ * If doSubRect is true, do the copy in four pieces instead of all at once.
+ */
+static void
+DoCopyTex(GLboolean doSubRect)
+{
+ if (doSubRect) {
+ /* copy in four parts */
+ int w = TexWidth / 2, h = TexHeight / 2;
+ int x0 = 0, y0 = 0;
+ int x1 = w, y1 = h;
+#if 1
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x0, y0, x0, y0, w, h);
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x1, y0, x1, y0, w, h);
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x0, y1, x0, y1, w, h);
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x1, y1, x1, y1, w, h);
+#else
+ /* scramble */
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x0, y0, x1, y1, w, h);
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x1, y0, x0, y1, w, h);
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x0, y1, x1, y0, w, h);
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, x1, y1, x0, y0, w, h);
+#endif
+ }
+ else {
+ glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, TexWidth, TexHeight);
+ }
+}
+
+
+/**
+ * Do glTexSubImage2D (update texture w/ user data)
+ * If doSubRect, do update in four pieces, else all at once.
+ */
+static void
+SubTex(GLboolean doSubRect, const GLubyte *image)
+{
+ if (doSubRect) {
+ /* four pieces */
+ int w = TexWidth / 2, h = TexHeight / 2;
+ int x0 = 0, y0 = 0;
+ int x1 = w, y1 = h;
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, TexWidth);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, y0);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, x0);
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x0, y0, w, h,
+ ReadFormat, GL_UNSIGNED_BYTE, image);
+
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, y0);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, x1);
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x1, y0, w, h,
+ ReadFormat, GL_UNSIGNED_BYTE, image);
+
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, y1);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, x0);
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x0, y1, w, h,
+ ReadFormat, GL_UNSIGNED_BYTE, image);
+
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, y1);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, x1);
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x1, y1, w, h,
+ ReadFormat, GL_UNSIGNED_BYTE, image);
+ }
+ else {
+ /* all at once */
+ glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, TexWidth, TexHeight,
+ ReadFormat, GL_UNSIGNED_BYTE, image);
+ }
+}
+
+
+/**
+ * Measure gl[Copy]TexSubImage rate.
+ * This actually also includes time to render a quad and SwapBuffers.
+ */
+static void
+RunTest(GLboolean copyTex, GLboolean doSubRect)
+{
+ double t1, t0 = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+ int iters = 0;
+ float copyRate, mbRate;
+ float rot = 0.0;
+ int bpp, r, g, b, a;
+ int w, h;
+ GLubyte *image = NULL;
+
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_SIZE, &r);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_SIZE, &g);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_SIZE, &b);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &a);
+ bpp = (r + g + b + a) / 8;
+
+ if (!copyTex) {
+ /* read image from frame buffer */
+ image = (GLubyte *) malloc(TexWidth * TexHeight * bpp);
+ glPixelStorei(GL_PACK_ALIGNMENT, 1);
+ glReadPixels(0, 0, TexWidth, TexHeight,
+ ReadFormat, GL_UNSIGNED_BYTE, image);
+ }
+
+ glEnable(GL_TEXTURE_2D);
+ glViewport(WinWidth / 2, 0, WinWidth / 2, WinHeight);
+
+ do {
+ if (copyTex)
+ /* Framebuffer -> Texture */
+ DoCopyTex(doSubRect);
+ else {
+ /* Main Mem -> Texture */
+ SubTex(doSubRect, image);
+ }
+
+ /* draw textured quad */
+ if (DrawQuad) {
+ glPushMatrix();
+ glRotatef(rot, 0, 0, 1);
+ glTranslatef(1, 0, 0);
+ glBegin(GL_POLYGON);
+ glTexCoord2f(0, 0); glVertex2f(-1, -1);
+ glTexCoord2f(1, 0); glVertex2f( 1, -1);
+ glTexCoord2f(1, 1); glVertex2f( 1, 1);
+ glTexCoord2f(0, 1); glVertex2f(-1, 1);
+ glEnd();
+ glPopMatrix();
+ }
+
+ iters++;
+ rot += 2.0;
+
+ t1 = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+ glutSwapBuffers();
+ } while (t1 - t0 < 5.0);
+
+ glDisable(GL_TEXTURE_2D);
+ if (image)
+ free(image);
+
+ if (doSubRect) {
+ w = TexWidth / 2;
+ h = TexHeight / 2;
+ iters *= 4;
+ }
+ else {
+ w = TexWidth;
+ h = TexHeight;
+ }
+
+ copyRate = iters / (t1 - t0);
+ mbRate = w * h * bpp * copyRate / (1024 * 1024);
+
+ if (copyTex)
+ printf("glCopyTexSubImage: %d x %d, %d Bpp:\n", w, h, bpp);
+ else
+ printf("glTexSubImage: %d x %d, %d Bpp:\n", w, h, bpp);
+ printf(" %d calls in %.2f = %.2f calls/sec, %.2f MB/s\n",
+ iters, t1-t0, copyRate, mbRate);
+}
+
+
+static void
+Draw(void)
+{
+ glClearColor(0.2, 0.2, 0.8, 0);
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ DrawTestImage();
+
+ RunTest(GL_FALSE, GL_FALSE);
+ RunTest(GL_FALSE, GL_TRUE);
+ RunTest(GL_TRUE, GL_FALSE);
+ RunTest(GL_TRUE, GL_TRUE);
+
+ glutSwapBuffers();
+
+ printf("exiting\n");
+ exit(0);
+}
+
+
+static void
+Reshape(int width, int height)
+{
+ glViewport(0, 0, width, height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glTranslatef(0.0, 0.0, -15.0);
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+SpecialKey(int key, int x, int y)
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case GLUT_KEY_UP:
+ break;
+ case GLUT_KEY_DOWN:
+ break;
+ case GLUT_KEY_LEFT:
+ break;
+ case GLUT_KEY_RIGHT:
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+Init(void)
+{
+ /* create initial, empty teximage */
+ glBindTexture(GL_TEXTURE_2D, TexObj);
+ glTexImage2D(GL_TEXTURE_2D, 0, IntFormat, TexWidth, TexHeight, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+}
+
+
+
+static void
+ParseArgs(int argc, char *argv[])
+{
+ int i;
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "-nodraw") == 0)
+ DrawQuad = GL_FALSE;
+ }
+}
+
+
+int
+main(int argc, char *argv[])
+{
+ GLint mode = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE | GLUT_DEPTH;
+ glutInit(&argc, argv);
+
+ ParseArgs(argc, argv);
+
+ glutInitWindowPosition(0, 0);
+ glutInitWindowSize(WinWidth, WinHeight);
+ glutInitDisplayMode(mode);
+ glutCreateWindow(argv[0]);
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutSpecialFunc(SpecialKey);
+ glutDisplayFunc(Draw);
+
+ printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER));
+ Init();
+
+ glutMainLoop();
+ return 0;
+}
projects / mesa.git / commitdiff