Mesa (master): progs/trivial: draw non-interleaved arrays out of one vbo

Keith Whitwell keithw at kemper.freedesktop.org
Tue Mar 24 08:31:03 PDT 2009


Module: Mesa
Branch: master
Commit: 2312f697a27da366ecda9cbae9ddf8c63de910d5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2312f697a27da366ecda9cbae9ddf8c63de910d5

Author: Keith Whitwell <keithw at vmware.com>
Date:   Tue Mar 24 15:27:21 2009 +0000

progs/trivial: draw non-interleaved arrays out of one vbo

---

 progs/trivial/Makefile           |    1 +
 progs/trivial/SConscript         |    1 +
 progs/trivial/tri-multitex-vbo.c |  260 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 262 insertions(+), 0 deletions(-)

diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile
index 082387d..69c71cb 100644
--- a/progs/trivial/Makefile
+++ b/progs/trivial/Makefile
@@ -111,6 +111,7 @@ SOURCES = \
 	tri-scissor-tri.c \
 	tri-stencil.c \
 	tri-stipple.c \
+	tri-multitex-vbo.c \
 	tri-tex.c \
 	tri-tex-3d.c \
 	tri-tri.c \
diff --git a/progs/trivial/SConscript b/progs/trivial/SConscript
index 6a9ffaf..480630e 100644
--- a/progs/trivial/SConscript
+++ b/progs/trivial/SConscript
@@ -107,6 +107,7 @@ progs = [
 	'tri-scissor-tri',
 	'tri-stencil',
 	'tri-stipple',
+	'tri-multitex-vbo',
 	'tri-tex',
 	'tri-tex-3d',
 	'tri-tri',
diff --git a/progs/trivial/tri-multitex-vbo.c b/progs/trivial/tri-multitex-vbo.c
new file mode 100644
index 0000000..76e117a
--- /dev/null
+++ b/progs/trivial/tri-multitex-vbo.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the name of
+ * Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
+ * ANY KIND,
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+
+#define NR_VERTS 4
+
+struct {
+   GLfloat position[NR_VERTS][4];
+   GLubyte color[NR_VERTS][4];
+   GLfloat tex0[NR_VERTS][2];
+   GLfloat tex1[NR_VERTS][2];
+} verts = {
+
+   { {  0.9, -0.9, 0.0, 1.0 },
+     {  0.9,  0.9, 0.0, 1.0 },
+     { -0.9,  0.9, 0.0, 1.0 },
+     { -0.9, -0.9, 0.0, 1.0 } },
+
+   { { 0x00, 0x00, 0xff, 0x00 },
+     { 0x00, 0xff, 0x00, 0x00 },
+     { 0xff, 0x00, 0x00, 0x00 },
+     { 0xff, 0xff, 0xff, 0x00 }
+   },
+
+   { {  1, -1 },
+     {  1,  1 },
+     { -1,  1 },
+     { -1, -1 } },
+
+   { { 3, 0 },
+     { 0, 3 },
+     { -3, 0 },
+     {  0, -3} },
+
+};
+
+GLuint indices[] = { 0, 1, 2, 3 };
+
+GLuint arrayObj, elementObj;
+
+
+GLenum doubleBuffer;
+
+
+#define Offset(ptr, member) (void *)((const char *)&((ptr)->member) - (const char *)(ptr))
+
+static void Init(void)
+{
+   GLuint texObj[2];
+
+   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
+   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
+   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+
+    glClearColor(0.0, 0.0, 1.0, 0.0);
+
+   glGenTextures(2, texObj);
+
+#define SIZE 32
+   {
+      GLubyte tex2d[SIZE][SIZE][3];
+      GLint s, t;
+
+      for (s = 0; s < SIZE; s++) {
+	 for (t = 0; t < SIZE; t++) {
+	    tex2d[t][s][0] = s*255/(SIZE-1);
+	    tex2d[t][s][1] = t*255/(SIZE-1);
+	    tex2d[t][s][2] = 0;
+	 }
+      }
+
+      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+      glActiveTextureARB(GL_TEXTURE0_ARB);
+      glBindTexture(GL_TEXTURE_2D, texObj[0]);
+
+
+      glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
+                   GL_RGB, GL_UNSIGNED_BYTE, tex2d);
+
+      glEnable(GL_TEXTURE_2D);
+      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
+      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+      glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+   }
+
+   {
+      GLubyte tex2d[SIZE][SIZE][3];
+      GLint s, t;
+
+      for (s = 0; s < SIZE; s++) {
+	 for (t = 0; t < SIZE; t++) {
+            GLboolean on = ((s/4) ^ (t/4)) & 1;
+	    tex2d[t][s][0] = on ? 128 : 0;
+	    tex2d[t][s][1] = on ? 128 : 0;
+	    tex2d[t][s][2] = on ? 128 : 0;
+	 }
+      }
+
+      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+      glActiveTextureARB(GL_TEXTURE1_ARB);
+      glBindTexture(GL_TEXTURE_2D, texObj[1]);
+
+      glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
+                   GL_RGB, GL_UNSIGNED_BYTE, tex2d);
+
+      glEnable(GL_TEXTURE_2D);
+      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
+      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
+      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+      glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+   }
+
+   glActiveTextureARB( GL_TEXTURE0_ARB );
+
+
+   {
+
+      glGenBuffersARB(1, &arrayObj);
+      glGenBuffersARB(1, &elementObj);
+   
+      glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj);
+      glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, elementObj);
+
+      glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), &verts, GL_STATIC_DRAW_ARB);
+      glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, sizeof(indices), indices, GL_STATIC_DRAW_ARB);
+
+      glEnableClientState( GL_VERTEX_ARRAY );
+      glVertexPointer( 4, GL_FLOAT, 0, Offset(&verts, position) );
+
+      glEnableClientState( GL_COLOR_ARRAY );
+      glColorPointer( 4, GL_UNSIGNED_BYTE, 0, Offset(&verts, color) );
+
+      glClientActiveTextureARB( GL_TEXTURE0_ARB );
+      glEnableClientState( GL_TEXTURE_COORD_ARRAY );
+      glTexCoordPointer( 2, GL_FLOAT, 0, Offset(&verts, tex0) );
+
+      glClientActiveTextureARB( GL_TEXTURE1_ARB );
+      glEnableClientState( GL_TEXTURE_COORD_ARRAY );
+      glTexCoordPointer( 2, GL_FLOAT, 0, Offset(&verts, tex1) );
+
+      glClientActiveTextureARB( GL_TEXTURE0_ARB );
+   }
+}
+
+static void Reshape(int width, int height)
+{
+
+    glViewport(0, 0, (GLint)width, (GLint)height);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+/*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
+    glMatrixMode(GL_MODELVIEW);
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+
+    switch (key) {
+      case 27:
+	exit(1);
+      default:
+	return;
+    }
+
+    glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT); 
+
+   glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, NULL );
+
+   glFlush();
+
+   if (doubleBuffer) {
+      glutSwapBuffers();
+   }
+}
+
+static GLenum Args(int argc, char **argv)
+{
+    GLint i;
+
+    doubleBuffer = GL_FALSE;
+
+    for (i = 1; i < argc; i++) {
+        if (strcmp(argv[i], "-sb") == 0) {
+	    doubleBuffer = GL_FALSE;
+	} else if (strcmp(argv[i], "-db") == 0) {
+	    doubleBuffer = GL_TRUE;
+	} else {
+	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
+	    return GL_FALSE;
+	}
+    }
+    return GL_TRUE;
+}
+
+int main(int argc, char **argv)
+{
+    GLenum type;
+
+    glutInit(&argc, argv);
+
+    if (Args(argc, argv) == GL_FALSE) {
+	exit(1);
+    }
+
+    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
+
+    type = GLUT_RGB | GLUT_ALPHA;
+    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+    glutInitDisplayMode(type);
+
+    if (glutCreateWindow(*argv) == GL_FALSE) {
+	exit(1);
+    }
+
+    glewInit();
+    Init();
+
+    glutReshapeFunc(Reshape);
+    glutKeyboardFunc(Key);
+    glutDisplayFunc(Draw);
+    glutMainLoop();
+	return 0;
+}



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