From f94e4f216f56a12b9ea9150950b65e0e24794950 Mon Sep 17 00:00:00 2001 From: Brian Date: Sun, 28 Jan 2007 19:01:04 -0700 Subject: simple noise test --- progs/glsl/Makefile | 1 + progs/glsl/noise.c | 296 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 297 insertions(+) create mode 100644 progs/glsl/noise.c (limited to 'progs/glsl') diff --git a/progs/glsl/Makefile b/progs/glsl/Makefile index fa7f191986..9ffffead2c 100644 --- a/progs/glsl/Makefile +++ b/progs/glsl/Makefile @@ -17,6 +17,7 @@ PROGS = \ brick \ bump \ mandelbrot \ + noise \ toyball diff --git a/progs/glsl/noise.c b/progs/glsl/noise.c new file mode 100644 index 0000000000..e115da3b12 --- /dev/null +++ b/progs/glsl/noise.c @@ -0,0 +1,296 @@ +/** + * Test noise() functions. + * 28 Jan 2007 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include "extfuncs.h" + + +static const char *VertShaderText = + "void main() {\n" + " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" + "}\n"; + +static const char *FragShaderText = + "uniform vec4 Scale, Bias;\n" + "uniform float Slice;\n" + "void main()\n" + "{\n" + " vec4 scale = vec4(5.0);\n" + " vec4 p;\n" + " p.xy = gl_TexCoord[0].xy;\n" + " p.z = Slice;\n" + " vec4 n = noise4(p * scale);\n" + " gl_FragColor = n * Scale + Bias;\n" + "}\n"; + + +struct uniform_info { + const char *name; + GLuint size; + GLint location; + GLfloat value[4]; +}; + +static struct uniform_info Uniforms[] = { + { "Scale", 4, -1, { 0.5, 0.4, 0.0, 0} }, + { "Bias", 4, -1, { 0.5, 0.3, 0.0, 0} }, + { "Slice", 1, -1, { 0.5, 0, 0, 0} }, + { NULL, 0, 0, { 0, 0, 0, 0 } } +}; + +/* program/shader objects */ +static GLuint fragShader; +static GLuint vertShader; +static GLuint program; + +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); + + glUniform1fv_func(Uniforms[2].location, 1, &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); + + glBegin(GL_POLYGON); + glTexCoord2f(0, 0); glVertex2f(-2, -2); + glTexCoord2f(1, 0); glVertex2f( 2, -2); + glTexCoord2f(1, 1); glVertex2f( 2, 2); + glTexCoord2f(0, 1); glVertex2f(-2, 2); + glEnd(); + + 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) +{ + glDeleteShader_func(fragShader); + glDeleteShader_func(vertShader); + glDeleteProgram_func(program); + 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 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, "brick: 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); + + fragShader = glCreateShader_func(GL_FRAGMENT_SHADER); + LoadAndCompileShader(fragShader, FragShaderText); + + program = glCreateProgram_func(); + glAttachShader_func(program, fragShader); + glAttachShader_func(program, vertShader); + glLinkProgram_func(program); + CheckLink(program); + glUseProgram_func(program); + + for (i = 0; Uniforms[i].name; i++) { + Uniforms[i].location + = glGetUniformLocation_func(program, Uniforms[i].name); + printf("Uniform %s location: %d\n", Uniforms[i].name, + Uniforms[i].location); + switch (Uniforms[i].size) { + case 1: + glUniform1fv_func(Uniforms[i].location, 1, Uniforms[i].value); + break; + case 2: + glUniform2fv_func(Uniforms[i].location, 1, Uniforms[i].value); + break; + case 3: + glUniform3fv_func(Uniforms[i].location, 1, Uniforms[i].value); + break; + case 4: + glUniform4fv_func(Uniforms[i].location, 1, Uniforms[i].value); + break; + default: + abort(); + } + } + + assert(glGetError() == 0); + + glClearColor(0.4f, 0.4f, 0.8f, 0.0f); + + printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER)); + + assert(glIsProgram_func(program)); + assert(glIsShader_func(fragShader)); + assert(glIsShader_func(vertShader)); + + glColor3f(1, 0, 0); +} + + +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