X-Git-Url: https://git.libre-soc.org/?p=mesa.git;a=blobdiff_plain;f=progs%2Ftests%2Fzreaddraw.c;h=0910eaaa799a77e5552d9a5ebdc15543d4c317ad;hp=8839e108360dc280c0579a63347e566d916949f0;hb=ccd13da0fc1f1813b55fc0d2181a6cb0d3b42b0d;hpb=f02f63997ce65530788a6dfcb28f11790a14d938

diff --git a/progs/tests/zreaddraw.c b/progs/tests/zreaddraw.c
index 8839e108360..0910eaaa799 100644
--- a/progs/tests/zreaddraw.c
+++ b/progs/tests/zreaddraw.c
@@ -11,15 +11,27 @@
 #include <GL/glew.h>
 #include <GL/glut.h>
 
-static GLint WinWidth = 500, WinHeight = 500;
+
+#define ZWIDTH 100
+#define ZHEIGHT 100
+
+#define ZOOM 4
+
+#define ZWIDTH2 (ZOOM * ZWIDTH)
+#define ZHEIGHT2 (ZOOM * ZHEIGHT)
+
+static GLint WinWidth = ZWIDTH + ZWIDTH2, WinHeight = ZHEIGHT + ZHEIGHT2;
+static GLboolean Invert = GL_FALSE;
+static GLboolean TestPacking = GL_FALSE;
+static GLboolean TestList = GL_FALSE;
 
 
 static void Display(void)
 {
-   GLfloat depth[100 * 100];
-   GLfloat depth2[400 * 400];
-   GLfloat min, max;
-   int i;
+   GLfloat depth[ZWIDTH * ZHEIGHT * 2];
+   GLfloat depth2[ZWIDTH2 * ZHEIGHT2]; /* *2 to test pixelstore stuff */
+   GLuint list;
+   GLenum depthType = GL_FLOAT;
 
    glClearColor(0.5, 0.5, 0.5, 1.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -27,7 +39,7 @@ static void Display(void)
    glEnable(GL_DEPTH_TEST);
 
    /* draw a sphere */
-   glViewport(0, 0, 100, 100);
+   glViewport(0, 0, ZWIDTH, ZHEIGHT);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-1, 1, -1, 1, -1, 0);  /* clip away back half of sphere */
@@ -35,30 +47,101 @@ static void Display(void)
    glLoadIdentity();
    glutSolidSphere(1.0, 20, 10);
 
+   if (TestPacking) {
+      glPixelStorei(GL_PACK_ROW_LENGTH, 120);
+      glPixelStorei(GL_PACK_SKIP_PIXELS, 5);
+   }
+
    /* read the depth image */
-   glReadPixels(0, 0, 100, 100, GL_DEPTH_COMPONENT, GL_FLOAT, depth);
-   min = max = depth[0];
-   for (i = 1; i < 100 * 100; i++) {
-      if (depth[i] < min)
-         min = depth[i];
-      if (depth[i] > max)
-         max = depth[i];
+   glReadPixels(0, 0, ZWIDTH, ZHEIGHT, GL_DEPTH_COMPONENT, depthType, depth);
+   if (depthType == GL_FLOAT) {
+      GLfloat min, max;
+      int i;
+      min = max = depth[0];
+      for (i = 1; i < ZWIDTH * ZHEIGHT; i++) {
+         if (depth[i] < min)
+            min = depth[i];
+         if (depth[i] > max)
+            max = depth[i];
+      }
+      printf("Depth value range: [%f, %f]\n", min, max);
+   }
+
+   /* debug */
+   if (0) {
+      int i;
+      float *z = depth + ZWIDTH * 50;
+      printf("z at y=50:\n");
+      for (i = 0; i < ZWIDTH; i++) {
+         printf("%5.3f ", z[i]);
+         if ((i + 1) % 12 == 0)
+            printf("\n");
+      }
+      printf("\n");
+   }
+
+   /* Draw the Z image as luminance above original rendering */
+   glWindowPos2i(0, ZHEIGHT);
+   glDrawPixels(ZWIDTH, ZHEIGHT, GL_LUMINANCE, depthType, depth);
+
+   if (TestPacking) {
+      glPixelStorei(GL_PACK_ROW_LENGTH, 0);
+      glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
+      glPixelStorei(GL_UNPACK_ROW_LENGTH, 120);
+      glPixelStorei(GL_UNPACK_SKIP_PIXELS, 5);
    }
-   printf("Depth value range: [%f, %f]\n", min, max);
 
    /* draw depth image with scaling (into z buffer) */
-   glPixelZoom(4.0, 4.0);
+   glPixelZoom(ZOOM, ZOOM);
    glColor4f(1, 0, 0, 0);
-   glWindowPos2i(100, 0);
-   glDrawPixels(100, 100, GL_DEPTH_COMPONENT, GL_FLOAT, depth);
+   glWindowPos2i(ZWIDTH, 0);
+   if (Invert) {
+      glPixelTransferf(GL_DEPTH_SCALE, -1.0);
+      glPixelTransferf(GL_DEPTH_BIAS, 1.0);
+   }
+   if (TestList) {
+      list = glGenLists(1);
+      glNewList(list, GL_COMPILE);
+      glDrawPixels(ZWIDTH, ZHEIGHT, GL_DEPTH_COMPONENT, depthType, depth);
+      glEndList();
+      glCallList(list);
+      glDeleteLists(list, 1);
+   }
+   else {
+      glDrawPixels(ZWIDTH, ZHEIGHT, GL_DEPTH_COMPONENT, depthType, depth);
+   }
+   if (Invert) {
+      glPixelTransferf(GL_DEPTH_SCALE, 1.0);
+      glPixelTransferf(GL_DEPTH_BIAS, 0.0);
+   }
+
+   if (TestPacking) {
+      glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+      glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+   }
 
    glDisable(GL_DEPTH_TEST);
 
    /* read back scaled depth image */
-   glReadPixels(100, 0, 400, 400, GL_DEPTH_COMPONENT, GL_FLOAT, depth2);
+   glReadPixels(ZWIDTH, 0, ZWIDTH2, ZHEIGHT2, GL_DEPTH_COMPONENT, GL_FLOAT, depth2);
+
+   /* debug */
+   if (0) {
+      int i;
+      float *z = depth2 + ZWIDTH2 * 200;
+      printf("z at y=200:\n");
+      for (i = 0; i < ZWIDTH2; i++) {
+         printf("%5.3f ", z[i]);
+         if ((i + 1) % 12 == 0)
+            printf("\n");
+      }
+      printf("\n");
+   }
+
    /* draw as luminance */
    glPixelZoom(1.0, 1.0);
-   glDrawPixels(400, 400, GL_LUMINANCE, GL_FLOAT, depth2);
+   glWindowPos2i(ZWIDTH, 0);
+   glDrawPixels(ZWIDTH2, ZHEIGHT2, GL_LUMINANCE, GL_FLOAT, depth2);
 
    glutSwapBuffers();
 }
@@ -77,6 +160,17 @@ static void Key(unsigned char key, int x, int y)
    (void) x;
    (void) y;
    switch (key) {
+      case 'i':
+         Invert = !Invert;
+         break;
+      case 'p':
+         TestPacking = !TestPacking;
+         printf("Test pixel pack/unpack: %d\n", TestPacking);
+         break;
+      case 'l':
+         TestList = !TestList;
+         printf("Test dlist: %d\n", TestList);
+         break;
       case 27:
          exit(0);
          break;
@@ -91,9 +185,13 @@ static void Init(void)
    const GLfloat gray[4] = {0.2, 0.2, 0.2, 1.0};
    const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
    const GLfloat pos[4] = {0, 0, 10, 0};
+   GLint z;
+
+   glGetIntegerv(GL_DEPTH_BITS, &z);
 
    printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+   printf("GL_DEPTH_BITS = %d\n", z);
 
    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, blue);
    glLightfv(GL_LIGHT0, GL_AMBIENT, gray);