More GLSL code.
- general constructors allowed;
- implement noise functions (from Stefan Gustavson - thanks!)
- cosmetic stuff.
diff --git a/progs/demos/glslnoise.c b/progs/demos/glslnoise.c
new file mode 100755
index 0000000..1041439
--- /dev/null
+++ b/progs/demos/glslnoise.c
@@ -0,0 +1,176 @@
+/*
+ * GLSL noise demo.
+ *
+ * Michal Krol
+ * 17 February 2006
+ *
+ * Based on the original demo by:
+ * Stefan Gustavson (stegu@itn.liu.se) 2004, 2005
+ */
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <GL/gl.h>
+#include <GL/glut.h>
+#include <GL/glext.h>
+
+#ifdef WIN32
+#define GETPROCADDRESS wglGetProcAddress
+#else
+#define GETPROCADDRESS glutGetProcAddress
+#endif
+
+static GLhandleARB fragShader;
+static GLhandleARB vertShader;
+static GLhandleARB program;
+
+static GLfloat u_time = 0.0f;
+
+static PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB = NULL;
+static PFNGLSHADERSOURCEARBPROC glShaderSourceARB = NULL;
+static PFNGLCOMPILESHADERARBPROC glCompileShaderARB = NULL;
+static PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB = NULL;
+static PFNGLATTACHOBJECTARBPROC glAttachObjectARB = NULL;
+static PFNGLLINKPROGRAMARBPROC glLinkProgramARB = NULL;
+static PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB = NULL;
+
+static void Redisplay (void)
+{
+ glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ /* XXX source from uniform time */
+ glTexCoord1f (u_time);
+
+ glPushMatrix ();
+ glutSolidSphere (2.0, 20, 10);
+ glPopMatrix ();
+
+ glutSwapBuffers();
+}
+
+static void Idle (void)
+{
+ u_time += 0.1f;
+ glutPostRedisplay ();
+}
+
+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 (0.0f, 0.0f, -15.0f);
+}
+
+static void Key (unsigned char key, int x, int y)
+{
+ (void) x;
+ (void) y;
+
+ switch (key)
+ {
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay ();
+}
+
+static void Init (void)
+{
+ static const char *fragShaderText =
+ "void main () {\n"
+
+ /* XXX source from uniform time */
+ " float time;\n"
+ " time = gl_TexCoord[1].x;\n"
+
+ " vec4 v;\n"
+ " v = vec4 (4.0 * gl_TexCoord[0].xyz, 0.5 * time);\n"
+ " gl_FragColor = gl_Color * vec4 ((0.5 + 0.5 * vec3 (noise1 (v))), 1.0);\n"
+ "}\n"
+ ;
+ static const char *vertShaderText =
+ "void main () {\n"
+ " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+ " gl_TexCoord[0] = gl_Vertex;\n"
+ " gl_FrontColor = gl_Color;\n"
+
+ /* XXX source from uniform time */
+ " gl_TexCoord[1] = gl_MultiTexCoord0;\n"
+ "}\n"
+ ;
+
+ if (!glutExtensionSupported ("GL_ARB_fragment_shader"))
+ {
+ printf ("Sorry, this demo requires GL_ARB_fragment_shader\n");
+ exit(1);
+ }
+ if (!glutExtensionSupported ("GL_ARB_shader_objects"))
+ {
+ printf ("Sorry, this demo requires GL_ARB_shader_objects\n");
+ exit(1);
+ }
+ if (!glutExtensionSupported ("GL_ARB_shading_language_100"))
+ {
+ printf ("Sorry, this demo requires GL_ARB_shading_language_100\n");
+ exit(1);
+ }
+ if (!glutExtensionSupported ("GL_ARB_vertex_shader"))
+ {
+ printf ("Sorry, this demo requires GL_ARB_vertex_shader\n");
+ exit(1);
+ }
+
+ glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) wglGetProcAddress ("glCreateShaderObjectARB");
+ glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) wglGetProcAddress ("glShaderSourceARB");
+ glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) wglGetProcAddress ("glCompileShaderARB");
+ glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) wglGetProcAddress ("glCreateProgramObjectARB");
+ glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) wglGetProcAddress ("glAttachObjectARB");
+ glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) wglGetProcAddress ("glLinkProgramARB");
+ glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) wglGetProcAddress ("glUseProgramObjectARB");
+
+ fragShader = glCreateShaderObjectARB (GL_FRAGMENT_SHADER_ARB);
+ glShaderSourceARB (fragShader, 1, &fragShaderText, NULL);
+ glCompileShaderARB (fragShader);
+
+ vertShader = glCreateShaderObjectARB (GL_VERTEX_SHADER_ARB);
+ glShaderSourceARB (vertShader, 1, &vertShaderText, NULL);
+ glCompileShaderARB (vertShader);
+
+ program = glCreateProgramObjectARB ();
+ glAttachObjectARB (program, fragShader);
+ glAttachObjectARB (program, vertShader);
+ glLinkProgramARB (program);
+ glUseProgramObjectARB (program);
+
+ glClearColor (0.0f, 0.1f, 0.3f, 1.0f);
+ glEnable (GL_CULL_FACE);
+ glEnable (GL_DEPTH_TEST);
+
+ printf ("GL_RENDERER = %s\n", (const char *) glGetString (GL_RENDERER));
+}
+
+int main (int argc, char *argv[])
+{
+ glutInit (&argc, argv);
+ glutInitWindowPosition ( 0, 0);
+ glutInitWindowSize (200, 200);
+ glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+ glutCreateWindow (argv[0]);
+ glutReshapeFunc (Reshape);
+ glutKeyboardFunc (Key);
+ glutDisplayFunc (Redisplay);
+ glutIdleFunc (Idle);
+ Init ();
+ glutMainLoop ();
+ return 0;
+}
+