Mesa (mesa_7_2_branch): Add "multinoise" demo, to test 1/2/3/ 4 dimensional noise.
Gary Wong
gary at kemper.freedesktop.org
Sat Dec 13 21:32:19 UTC 2008
Module: Mesa
Branch: mesa_7_2_branch
Commit: 112ddd776f7925a53da579689d5ab5cff2d78bad
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=112ddd776f7925a53da579689d5ab5cff2d78bad
Author: Gary Wong <gtw at gnu.org>
Date: Sat Dec 13 14:00:37 2008 -0700
Add "multinoise" demo, to test 1/2/3/4 dimensional noise.
(cherry picked from commit d427a2910fbb130c1be49667b0133c7605eef7ed)
---
progs/glsl/.gitignore | 1 +
progs/glsl/Makefile | 1 +
progs/glsl/multinoise.c | 277 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 279 insertions(+), 0 deletions(-)
diff --git a/progs/glsl/.gitignore b/progs/glsl/.gitignore
index 1e0aece..21c41da 100644
--- a/progs/glsl/.gitignore
+++ b/progs/glsl/.gitignore
@@ -4,6 +4,7 @@ bump
deriv
extfuncs.h
mandelbrot
+multinoise
multitex
noise
points
diff --git a/progs/glsl/Makefile b/progs/glsl/Makefile
index 850b6bd..384649e 100644
--- a/progs/glsl/Makefile
+++ b/progs/glsl/Makefile
@@ -16,6 +16,7 @@ PROGS = \
convolutions \
deriv \
mandelbrot \
+ multinoise \
multitex \
noise \
points \
diff --git a/progs/glsl/multinoise.c b/progs/glsl/multinoise.c
new file mode 100644
index 0000000..914b872
--- /dev/null
+++ b/progs/glsl/multinoise.c
@@ -0,0 +1,277 @@
+/**
+ * Another test for noise() functions (noise1 to noise4 tested independently).
+ * 13 Dec 2008
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/gl.h>
+#include <GL/glut.h>
+#include <GL/glext.h>
+#include "extfuncs.h"
+
+static const char *VertShaderText =
+ "void main() {\n"
+ " gl_TexCoord[0].xyz = gl_Vertex.xyz;\n"
+ " gl_TexCoord[0].w = gl_MultiTexCoord1.x;\n"
+ " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+ "}\n";
+
+static const char *FragShaderText[ 4 ] = {
+ "void main()\n"
+ "{\n"
+ " gl_FragColor = noise3( gl_TexCoord[ 0 ].w ) * 0.5 + 0.5;\n"
+ "}\n",
+ "void main()\n"
+ "{\n"
+ " gl_FragColor = noise3( gl_TexCoord[ 0 ].xw ) * 0.5 + 0.5;\n"
+ "}\n",
+ "void main()\n"
+ "{\n"
+ " gl_FragColor = noise3( gl_TexCoord[ 0 ].xyw ) * 0.5 + 0.5;\n"
+ "}\n",
+ "void main()\n"
+ "{\n"
+ " gl_FragColor = noise3( gl_TexCoord[ 0 ].xyzw ) * 0.5 + 0.5;\n"
+ "}\n"
+};
+
+struct uniform_info {
+ const char *name;
+ GLuint size;
+ GLint location;
+ GLfloat value[4];
+};
+
+/* program/shader objects */
+static GLuint fragShader[ 4 ];
+static GLuint vertShader;
+static GLuint program[ 4 ];
+
+static GLint win = 0;
+static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f;
+static GLfloat Slice = 0.0;
+static GLboolean Anim = GL_FALSE;
+
+
+static void
+Idle(void)
+{
+ Slice += 0.01;
+ glutPostRedisplay();
+}
+
+
+static void
+Redisplay(void)
+{
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ glMultiTexCoord1f( GL_TEXTURE1, Slice );
+
+ glPushMatrix();
+ glRotatef(xRot, 1.0f, 0.0f, 0.0f);
+ glRotatef(yRot, 0.0f, 1.0f, 0.0f);
+ glRotatef(zRot, 0.0f, 0.0f, 1.0f);
+
+ glutSolidTeapot( 1.0 );
+
+ glPopMatrix();
+
+ glutSwapBuffers();
+}
+
+
+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
+CleanUp(void)
+{
+ GLint i;
+
+ glDeleteShader_func(vertShader);
+ for( i = 0; i < 4; i++ ) {
+ glDeleteShader_func(fragShader[ i ]);
+ glDeleteProgram_func(program[ i ]);
+ }
+ glutDestroyWindow(win);
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+ const GLfloat step = 0.01;
+ (void) x;
+ (void) y;
+
+ switch(key) {
+ case 'a':
+ Anim = !Anim;
+ glutIdleFunc(Anim ? Idle : NULL);
+ case 's':
+ Slice -= step;
+ break;
+ case 'S':
+ Slice += step;
+ break;
+ case 'z':
+ zRot -= 1.0;
+ break;
+ case 'Z':
+ zRot += 1.0;
+ break;
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ glUseProgram_func(program[ key - '1' ]);
+ break;
+ case 27:
+ CleanUp();
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+SpecialKey(int key, int x, int y)
+{
+ const GLfloat step = 3.0f;
+
+ (void) x;
+ (void) y;
+
+ switch(key) {
+ case GLUT_KEY_UP:
+ xRot -= step;
+ break;
+ case GLUT_KEY_DOWN:
+ xRot += step;
+ break;
+ case GLUT_KEY_LEFT:
+ yRot -= step;
+ break;
+ case GLUT_KEY_RIGHT:
+ yRot += step;
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+
+static void
+LoadAndCompileShader(GLuint shader, const char *text)
+{
+ GLint stat;
+
+ glShaderSource_func(shader, 1, (const GLchar **) &text, NULL);
+
+ glCompileShader_func(shader);
+
+ glGetShaderiv_func(shader, GL_COMPILE_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetShaderInfoLog_func(shader, 1000, &len, log);
+ fprintf(stderr, "noise: problem compiling shader: %s\n", log);
+ exit(1);
+ }
+ else {
+ printf("Shader compiled OK\n");
+ }
+}
+
+
+static void
+CheckLink(GLuint prog)
+{
+ GLint stat;
+ glGetProgramiv_func(prog, GL_LINK_STATUS, &stat);
+ if (!stat) {
+ GLchar log[1000];
+ GLsizei len;
+ glGetProgramInfoLog_func(prog, 1000, &len, log);
+ fprintf(stderr, "Linker error:\n%s\n", log);
+ }
+ else {
+ fprintf(stderr, "Link success!\n");
+ }
+}
+
+
+static void
+Init(void)
+{
+ const char *version;
+ GLint i;
+
+ version = (const char *) glGetString(GL_VERSION);
+ if (version[0] != '2' || version[1] != '.') {
+ printf("Warning: this program expects OpenGL 2.0\n");
+ /*exit(1);*/
+ }
+
+ GetExtensionFuncs();
+
+ vertShader = glCreateShader_func(GL_VERTEX_SHADER);
+ LoadAndCompileShader(vertShader, VertShaderText);
+
+ for( i = 0; i < 4; i++ ) {
+ fragShader[ i ] = glCreateShader_func(GL_FRAGMENT_SHADER);
+ LoadAndCompileShader(fragShader[ i ], FragShaderText[ i ]);
+ program[ i ] = glCreateProgram_func();
+ glAttachShader_func(program[ i ], fragShader[ i ]);
+ glAttachShader_func(program[ i ], vertShader);
+ glLinkProgram_func(program[ i ]);
+ CheckLink(program[ i ]);
+ }
+
+ glUseProgram_func(program[ 0 ]);
+
+ assert(glGetError() == 0);
+
+ glClearColor(0.4f, 0.4f, 0.8f, 0.0f);
+
+ glColor3f(1, 0, 0);
+
+ glFrontFace( GL_CW );
+ glEnable( GL_CULL_FACE );
+ glEnable( GL_DEPTH_TEST );
+}
+
+
+int
+main(int argc, char *argv[])
+{
+ glutInit(&argc, argv);
+ glutInitWindowPosition( 0, 0);
+ glutInitWindowSize(400, 400);
+ glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+ win = glutCreateWindow(argv[0]);
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutSpecialFunc(SpecialKey);
+ glutDisplayFunc(Redisplay);
+ Init();
+ glutMainLoop();
+ return 0;
+}
+
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