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/*! \file shapes.c \ingroup demos This program is a test harness for the various shapes in OpenGLUT. It may also be useful to see which parameters control what behavior in the OpenGLUT objects. Spinning wireframe and solid-shaded shapes are displayed. Some parameters can be adjusted. Keys: - <tt>Esc &nbsp;</tt> Quit - <tt>q Q &nbsp;</tt> Quit - <tt>i I &nbsp;</tt> Show info - <tt>p P &nbsp;</tt> Toggle perspective or orthographic projection - <tt>r R &nbsp;</tt> Toggle fixed or animated rotation around model X-axis - <tt>s S &nbsp;</tt> Toggle toggle fixed function or shader render path - <tt>n N &nbsp;</tt> Toggle visualization of object's normal vectors - <tt>= + &nbsp;</tt> Increase \a slices - <tt>- _ &nbsp;</tt> Decreate \a slices - <tt>, < &nbsp;</tt> Decreate \a stacks - <tt>. > &nbsp;</tt> Increase \a stacks - <tt>9 ( &nbsp;</tt> Decreate \a depth (Sierpinski Sponge) - <tt>0 ) &nbsp;</tt> Increase \a depth (Sierpinski Sponge) - <tt>up&nbsp; &nbsp;</tt> Increase "outer radius" - <tt>down&nbsp;</tt> Decrease "outer radius" - <tt>left&nbsp;</tt> Decrease "inner radius" - <tt>right</tt> Increase "inner radius" - <tt>PgUp&nbsp;</tt> Next shape-drawing function - <tt>PgDn&nbsp;</tt> Prev shape-drawing function \author Written by Nigel Stewart November 2003 \author Portions Copyright (C) 2004, the OpenGLUT project contributors. <br> OpenGLUT branched from freeglut in February, 2004. \image html openglut_shapes.png OpenGLUT Geometric Shapes Demonstration \include demos/shapes/shapes.c */ #include <GL/freeglut.h> #include <stdarg.h> #include <stdio.h> #include <stdlib.h> #include <stddef.h> #include "glmatrix.h" #ifdef _MSC_VER /* DUMP MEMORY LEAKS */ #include <crtdbg.h> #endif /* report GL errors, if any, to stderr */ void checkError(const char *functionName) { GLenum error; while (( error = glGetError() ) != GL_NO_ERROR) { fprintf (stderr, "GL error 0x%X detected in %s\n", error, functionName); } } /* * OpenGL 2+ shader mode needs some function and macro definitions, * avoiding a dependency on additional libraries like GLEW or the * GL/glext.h header */ #ifndef GL_FRAGMENT_SHADER #define GL_FRAGMENT_SHADER 0x8B30 #endif #ifndef GL_VERTEX_SHADER #define GL_VERTEX_SHADER 0x8B31 #endif #ifndef GL_COMPILE_STATUS #define GL_COMPILE_STATUS 0x8B81 #endif #ifndef GL_LINK_STATUS #define GL_LINK_STATUS 0x8B82 #endif #ifndef GL_INFO_LOG_LENGTH #define GL_INFO_LOG_LENGTH 0x8B84 #endif typedef ptrdiff_t ourGLsizeiptr; typedef char ourGLchar; #ifndef APIENTRY #define APIENTRY #endif #ifndef GL_VERSION_2_0 typedef GLuint (APIENTRY *PFNGLCREATESHADERPROC) (GLenum type); typedef void (APIENTRY *PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const ourGLchar **string, const GLint *length); typedef void (APIENTRY *PFNGLCOMPILESHADERPROC) (GLuint shader); typedef GLuint (APIENTRY *PFNGLCREATEPROGRAMPROC) (void); typedef void (APIENTRY *PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader); typedef void (APIENTRY *PFNGLLINKPROGRAMPROC) (GLuint program); typedef void (APIENTRY *PFNGLUSEPROGRAMPROC) (GLuint program); typedef void (APIENTRY *PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params); typedef void (APIENTRY *PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, ourGLchar *infoLog); typedef void (APIENTRY *PFNGLGETPROGRAMIVPROC) (GLenum target, GLenum pname, GLint *params); typedef void (APIENTRY *PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, ourGLchar *infoLog); typedef GLint (APIENTRY *PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const ourGLchar *name); typedef GLint (APIENTRY *PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const ourGLchar *name); typedef void (APIENTRY *PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value); typedef void (APIENTRY *PFNGLUNIFORMMATRIX3FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value); #endif PFNGLCREATESHADERPROC gl_CreateShader; PFNGLSHADERSOURCEPROC gl_ShaderSource; PFNGLCOMPILESHADERPROC gl_CompileShader; PFNGLCREATEPROGRAMPROC gl_CreateProgram; PFNGLATTACHSHADERPROC gl_AttachShader; PFNGLLINKPROGRAMPROC gl_LinkProgram; PFNGLUSEPROGRAMPROC gl_UseProgram; PFNGLGETSHADERIVPROC gl_GetShaderiv; PFNGLGETSHADERINFOLOGPROC gl_GetShaderInfoLog; PFNGLGETPROGRAMIVPROC gl_GetProgramiv; PFNGLGETPROGRAMINFOLOGPROC gl_GetProgramInfoLog; PFNGLGETATTRIBLOCATIONPROC gl_GetAttribLocation; PFNGLGETUNIFORMLOCATIONPROC gl_GetUniformLocation; PFNGLUNIFORMMATRIX4FVPROC gl_UniformMatrix4fv; PFNGLUNIFORMMATRIX3FVPROC gl_UniformMatrix3fv; void initExtensionEntries(void) { gl_CreateShader = (PFNGLCREATESHADERPROC) glutGetProcAddress ("glCreateShader"); gl_ShaderSource = (PFNGLSHADERSOURCEPROC) glutGetProcAddress ("glShaderSource"); gl_CompileShader = (PFNGLCOMPILESHADERPROC) glutGetProcAddress ("glCompileShader"); gl_CreateProgram = (PFNGLCREATEPROGRAMPROC) glutGetProcAddress ("glCreateProgram"); gl_AttachShader = (PFNGLATTACHSHADERPROC) glutGetProcAddress ("glAttachShader"); gl_LinkProgram = (PFNGLLINKPROGRAMPROC) glutGetProcAddress ("glLinkProgram"); gl_UseProgram = (PFNGLUSEPROGRAMPROC) glutGetProcAddress ("glUseProgram"); gl_GetShaderiv = (PFNGLGETSHADERIVPROC) glutGetProcAddress ("glGetShaderiv"); gl_GetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC) glutGetProcAddress ("glGetShaderInfoLog"); gl_GetProgramiv = (PFNGLGETPROGRAMIVPROC) glutGetProcAddress ("glGetProgramiv"); gl_GetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC) glutGetProcAddress ("glGetProgramInfoLog"); gl_GetAttribLocation = (PFNGLGETATTRIBLOCATIONPROC) glutGetProcAddress ("glGetAttribLocation"); gl_GetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC) glutGetProcAddress ("glGetUniformLocation"); gl_UniformMatrix4fv = (PFNGLUNIFORMMATRIX4FVPROC) glutGetProcAddress ("glUniformMatrix4fv"); gl_UniformMatrix3fv = (PFNGLUNIFORMMATRIX3FVPROC) glutGetProcAddress ("glUniformMatrix3fv"); if (!gl_CreateShader || !gl_ShaderSource || !gl_CompileShader || !gl_CreateProgram || !gl_AttachShader || !gl_LinkProgram || !gl_UseProgram || !gl_GetShaderiv || !gl_GetShaderInfoLog || !gl_GetProgramiv || !gl_GetProgramInfoLog || !gl_GetAttribLocation || !gl_GetUniformLocation || !gl_UniformMatrix4fv || !gl_UniformMatrix3fv) { fprintf (stderr, "glCreateShader, glShaderSource, glCompileShader, glCreateProgram, glAttachShader, glLinkProgram, glUseProgram, glGetShaderiv, glGetShaderInfoLog, glGetProgramiv, glGetProgramInfoLog, glGetAttribLocation, glGetUniformLocation, glUniformMatrix4fv or gl_UniformMatrix3fv not found"); exit(1); } } const ourGLchar *vertexShaderSource[] = { "/**", " * From the OpenGL Programming wikibook: http://en.wikibooks.org/wiki/GLSL_Programming/GLUT/Smooth_Specular_Highlights", " * This file is in the public domain.", " * Contributors: Sylvain Beucler", " */", "attribute vec3 fg_coord;", "attribute vec3 fg_normal;", "varying vec4 position; /* position of the vertex (and fragment) in world space */", "varying vec3 varyingNormalDirection; /* surface normal vector in world space */", "uniform mat4 m, p; /* don't need v, as always identity in our demo */", "uniform mat3 m_3x3_inv_transp;", " ", "void main()", "{", " vec4 fg_coord4 = vec4(fg_coord, 1.0);", " position = m * fg_coord4;", " varyingNormalDirection = normalize(m_3x3_inv_transp * fg_normal);", " ", " mat4 mvp = p*m; /* normally p*v*m */", " gl_Position = mvp * fg_coord4;", "}" }; const ourGLchar *fragmentShaderSource[] = { "/**", " * From the OpenGL Programming wikibook: http://en.wikibooks.org/wiki/GLSL_Prog