Demos (master): tri-tex-stipple: trivial test of texturing with stippling

[Brian Paul]

Module: Demos
Branch: master
Commit: d658af70f5bc2c187688d59162f5e1f9db277a2d
URL:    http://cgit.freedesktop.org/mesa/demos/commit/?id=d658af70f5bc2c187688d59162f5e1f9db277a2d

Author: Brian Paul <brianp at vmware.com>
Date:   Mon Jul 20 15:34:22 2015 -0600

tri-tex-stipple: trivial test of texturing with stippling

---

 src/trivial/CMakeLists.txt    |    1 +
 src/trivial/Makefile.am       |    1 +
 src/trivial/tri-tex-stipple.c |  120 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 122 insertions(+)

diff --git a/src/trivial/CMakeLists.txt b/src/trivial/CMakeLists.txt
index b42d1f9..04f739b 100644
--- a/src/trivial/CMakeLists.txt
+++ b/src/trivial/CMakeLists.txt
@@ -158,6 +158,7 @@ set (targets
 	tri-tex-1d
 	tri-tex-3d
 	tri-tex
+	tri-tex-stipple
 	tri-tri
 	tri-unfilled
 	tri-unfilled-clip
diff --git a/src/trivial/Makefile.am b/src/trivial/Makefile.am
index 87d4e40..1c53ef5 100644
--- a/src/trivial/Makefile.am
+++ b/src/trivial/Makefile.am
@@ -170,6 +170,7 @@ bin_PROGRAMS = \
 	tri-tex-1d \
 	tri-tex-3d \
 	tri-tex \
+	tri-tex-stipple \
 	tri-tri \
 	tri-unfilled \
 	tri-unfilled-clip \
diff --git a/src/trivial/tri-tex-stipple.c b/src/trivial/tri-tex-stipple.c
new file mode 100644
index 0000000..8f1ac90
--- /dev/null
+++ b/src/trivial/tri-tex-stipple.c
@@ -0,0 +1,120 @@
+/* test texturing + stippling */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <GL/glew.h>
+#include "glut_wrap.h"
+
+
+static GLubyte fly[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+0x03, 0x80, 0x01, 0xC0, 0x06, 0xC0, 0x03, 0x60, 0x04, 0x60, 0x06, 0x20,
+0x04, 0x30, 0x0C, 0x20, 0x04, 0x18, 0x18, 0x20, 0x04, 0x0C, 0x30, 0x20,
+0x04, 0x06, 0x60, 0x20, 0x44, 0x03, 0xC0, 0x22, 0x44, 0x01, 0x80, 0x22,
+0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
+0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 0x66, 0x01, 0x80, 0x66,
+0x33, 0x01, 0x80, 0xCC, 0x19, 0x81, 0x81, 0x98, 0x0C, 0xC1, 0x83, 0x30,
+0x07, 0xe1, 0x87, 0xe0, 0x03, 0x3f, 0xfc, 0xc0, 0x03, 0x31, 0x8c, 0xc0,
+0x03, 0x33, 0xcc, 0xc0, 0x06, 0x64, 0x26, 0x60, 0x0c, 0xcc, 0x33, 0x30,
+0x18, 0xcc, 0x33, 0x18, 0x10, 0xc4, 0x23, 0x08, 0x10, 0x63, 0xC6, 0x08,
+0x10, 0x30, 0x0c, 0x08, 0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08};
+
+
+static void
+Init(void)
+{
+   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));
+   fflush(stderr);
+
+   glClearColor(0.0, 0.0, 1.0, 1.0);
+
+#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;
+	 }
+      }
+
+      glEnable(GL_TEXTURE_2D);
+      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+      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, 1);
+      glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
+                   GL_RGB, GL_UNSIGNED_BYTE, tex2d);
+   }
+
+   glEnable (GL_POLYGON_STIPPLE);
+   glPolygonStipple (fly);
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport(0, 0, (GLint)width, (GLint)height);
+
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glMatrixMode(GL_MODELVIEW);
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+   if (key == 27)
+      exit(1);
+
+   glutPostRedisplay();
+}
+
+
+static void
+Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   glBegin(GL_TRIANGLES);
+   glTexCoord2f(1,-1);
+   glVertex3f(0.9, -0.9, -0.0);
+   glTexCoord2f(1,1);
+   glVertex3f(0.9,  0.9, -0.0);
+   glTexCoord2f(-1,0);
+   glVertex3f(-0.9,  0.0, -0.0);
+   glEnd();
+
+   glutSwapBuffers();
+}
+
+
+int
+main(int argc, char **argv)
+{
+   glutInit(&argc, argv);
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(250, 250);
+   glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
+
+   if (glutCreateWindow(*argv) == GL_FALSE) {
+      exit(1);
+   }
+
+   Init();
+
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutDisplayFunc(Draw);
+   glutMainLoop();
+
+   return 0;
+}