From d427a2910fbb130c1be49667b0133c7605eef7ed Mon Sep 17 00:00:00 2001 From: Gary Wong Date: Sat, 13 Dec 2008 14:00:37 -0700 Subject: Add "multinoise" demo, to test 1/2/3/4 dimensional noise. --- progs/glsl/.gitignore | 1 + progs/glsl/Makefile | 1 + progs/glsl/multinoise.c | 277 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 279 insertions(+) create mode 100644 progs/glsl/multinoise.c diff --git a/progs/glsl/.gitignore b/progs/glsl/.gitignore index 1e0aecebef..21c41da0cd 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 ab024cecad..856de91c90 100644 --- a/progs/glsl/Makefile +++ b/progs/glsl/Makefile @@ -17,6 +17,7 @@ PROGS = \ deriv \ fragcoord \ mandelbrot \ + multinoise \ multitex \ noise \ points \ diff --git a/progs/glsl/multinoise.c b/progs/glsl/multinoise.c new file mode 100644 index 0000000000..914b872f44 --- /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 +#include +#include +#include +#include +#include +#include +#include +#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; +} + -- cgit v1.2.3