demos: move glslnoise.c demo to glsl/noise2.c

2 files changed, 209 insertions, 0 deletions

diff --git a/progs/glsl/Makefile b/progs/glsl/Makefile
index 5fb95c4..8e61ab6 100644
--- a/progs/glsl/Makefile
+++ b/progs/glsl/Makefile
@@ -23,6 +23,7 @@ PROGS = \
 	multinoise \
 	multitex \
 	noise \
+	noise2 \
 	points \
 	pointcoord \
 	samplers \
@@ -163,6 +164,13 @@ noise: noise.o shaderutil.o
 	$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) noise.o shaderutil.o $(LIBS) -o $@
 
 
+noise2.o: noise2.c extfuncs.h shaderutil.h
+	$(APP_CC) -c -I$(INCDIR) $(CFLAGS) noise2.c
+
+noise2: noise2.o shaderutil.o
+	$(APP_CC) -I$(INCDIR) $(CFLAGS) $(LDFLAGS) noise2.o shaderutil.o $(LIBS) -o $@
+
+
 points.o: points.c extfuncs.h shaderutil.h
 	$(APP_CC) -c -I$(INCDIR) $(CFLAGS) points.c
 
diff --git a/progs/glsl/noise2.c b/progs/glsl/noise2.c
new file mode 100644
index 0000000..e972b62
--- /dev/null
+++ b/progs/glsl/noise2.c
@@ -0,0 +1,201 @@
+/*
+ * GLSL noise demo.
+ *
+ * Michal Krol
+ * 20 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(F) wglGetProcAddress(F)
+#else
+#define GETPROCADDRESS(F) glutGetProcAddress(F)
+#endif
+
+static GLhandleARB fragShader;
+static GLhandleARB vertShader;
+static GLhandleARB program;
+
+static GLint uTime;
+
+static GLint t0 = 0;
+static GLint frames = 0;
+
+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 PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB = NULL;
+static PFNGLUNIFORM1FARBPROC glUniform1fARB = NULL;
+
+static void Redisplay (void)
+{
+   GLint t;
+
+	glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	glUniform1fARB (uTime, 0.5f * u_time);
+
+	glPushMatrix ();
+	glutSolidSphere (2.0, 20, 10);
+	glPopMatrix ();
+
+	glutSwapBuffers();
+   frames++;
+
+   t = glutGet (GLUT_ELAPSED_TIME);
+   if (t - t0 >= 5000) {
+      GLfloat seconds = (GLfloat) (t - t0) / 1000.0f;
+      GLfloat fps = frames / seconds;
+      printf ("%d frames in %6.3f seconds = %6.3f FPS\n", frames, seconds, fps);
+      fflush(stdout);
+      t0 = t;
+      frames = 0;
+   }
+}
+
+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 =
+      "uniform float time;\n"
+      "varying vec3 position;\n"
+      "void main () {\n"
+      "   gl_FragColor = vec4 (vec3 (0.5 + 0.5 * noise1 (vec4 (position, time))), 1.0);\n"
+      "}\n"
+   ;
+   static const char *vertShaderText =
+      "varying vec3 position;\n"
+      "void main () {\n"
+      "   gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+      "   position = 4.0 * gl_Vertex.xyz;\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)
+		GETPROCADDRESS("glCreateShaderObjectARB");
+ 	glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC)
+		GETPROCADDRESS("glShaderSourceARB");
+ 	glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC)
+		GETPROCADDRESS("glCompileShaderARB");
+ 	glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC)
+		GETPROCADDRESS("glCreateProgramObjectARB");
+ 	glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC)
+		GETPROCADDRESS("glAttachObjectARB");
+ 	glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC)
+		GETPROCADDRESS ("glLinkProgramARB");
+ 	glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC)
+		GETPROCADDRESS("glUseProgramObjectARB");          
+
+	glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC)
+		GETPROCADDRESS("glGetUniformLocationARB");
+	glUniform1fARB = (PFNGLUNIFORM1FARBPROC)
+		GETPROCADDRESS("glUniform1fARB");
+
+	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);
+
+	uTime = glGetUniformLocationARB (program, "time");
+
+	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;
+}
+