From 3d7236a47012820bc599d17373500b313647eb16 Mon Sep 17 00:00:00 2001 From: spanne Date: Sun, 15 Feb 2009 17:53:48 +0000 Subject: [PATCH] Use GLSL shaders (still 1.20, though). Dump GL info. git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@777 7f0cb862-5218-0410-a997-914c9d46530a --- .../demos/smooth_opengl3/smooth_opengl3.c | 174 +++++++++++++++++- 1 file changed, 169 insertions(+), 5 deletions(-) diff --git a/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c b/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c index 0d08338..358f93b 100755 --- a/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c +++ b/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c @@ -45,6 +45,7 @@ #include #include #include +#include /* report GL errors, if any, to stderr */ void checkError(const char *functionName) @@ -55,8 +56,28 @@ void checkError(const char *functionName) } } -/* extension types and entries, avoiding a dependency on additional libraries - like GLEW or the GL/glext.h header */ +/* extension #defines, types and entries, avoiding a dependency on additional + libraries like GLEW or the GL/glext.h header */ +#ifndef GL_VERTEX_SHADER +#define GL_VERTEX_SHADER 0x8B31 +#endif + +#ifndef GL_SHADING_LANGUAGE_VERSION +#define GL_SHADING_LANGUAGE_VERSION 0x8B8C +#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 void (*PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers); PFNGLGENBUFFERSPROC gl_GenBuffers; @@ -67,11 +88,58 @@ typedef void (*PFNGLBUFFERDATAPROC) (GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage); PFNGLBUFFERDATAPROC gl_BufferData; +typedef GLuint (*PFNGLCREATESHADERPROC) (GLenum type); +PFNGLCREATESHADERPROC gl_CreateShader; + +typedef void (*PFNGLSHADERSOURCEPROC) + (GLuint shader, GLsizei count, const GLchar **string, const GLint *length); +PFNGLSHADERSOURCEPROC gl_ShaderSource; + +typedef void (*PFNGLCOMPILESHADERPROC) (GLuint shader); +PFNGLCOMPILESHADERPROC gl_CompileShader; + +typedef GLuint (*PFNGLCREATEPROGRAMPROC) (void); +PFNGLCREATEPROGRAMPROC gl_CreateProgram; + +typedef void (*PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader); +PFNGLATTACHSHADERPROC gl_AttachShader; + +typedef void (*PFNGLLINKPROGRAMPROC) (GLuint program); +PFNGLLINKPROGRAMPROC gl_LinkProgram; + +typedef void (*PFNGLUSEPROGRAMPROC) (GLuint program); +PFNGLUSEPROGRAMPROC gl_UseProgram; + +typedef void (*PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params); +PFNGLGETSHADERIVPROC gl_GetShaderiv; + +typedef void (*PFNGLGETSHADERINFOLOGPROC) + (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog); +PFNGLGETSHADERINFOLOGPROC gl_GetShaderInfoLog; + +typedef void (*PFNGLGETPROGRAMIVPROC) (GLenum target, GLenum pname, GLint *params); +PFNGLGETPROGRAMIVPROC gl_GetProgramiv; + +typedef void (*PFNGLGETPROGRAMINFOLOGPROC) + (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog); +PFNGLGETPROGRAMINFOLOGPROC gl_GetProgramInfoLog; + void initExtensionEntries(void) { gl_GenBuffers = (PFNGLGENBUFFERSPROC) glutGetProcAddress ("glGenBuffers"); gl_BindBuffer = (PFNGLBINDBUFFERPROC) glutGetProcAddress ("glBindBuffer"); gl_BufferData = (PFNGLBUFFERDATAPROC) glutGetProcAddress ("glBufferData"); + 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"); } /* vertex array data for a colored 2D triangle, consisting of RGB color values @@ -108,6 +176,91 @@ void initBuffer(void) checkError ("initBuffer"); } +const GLchar *vertexShaderSource[] = { + "#version 120\n", + "void main(void)\n", + "{\n", + " gl_FrontColor = gl_Color;\n", + " gl_Position = ftransform();\n", + "}\n" +}; + +const GLchar *fragmentShaderSource[] = { + "#version 120\n", + "void main(void)\n", + "{\n", + " gl_FragColor = gl_Color;\n", + "}\n" +}; + +void compileAndCheck(GLuint shader) +{ + GLint status; + gl_CompileShader (shader); + gl_GetShaderiv (shader, GL_COMPILE_STATUS, &status); + if (status == GL_FALSE) { + GLint infoLogLength; + GLchar *infoLog; + gl_GetShaderiv (shader, GL_INFO_LOG_LENGTH, &infoLogLength); + infoLog = (GLchar*) malloc (infoLogLength); + gl_GetShaderInfoLog (shader, infoLogLength, NULL, infoLog); + fprintf (stderr, "compile log: %s\n", infoLog); + free (infoLog); + } +} + +GLuint compileShaderSource(GLenum type, GLsizei count, const GLchar **string) +{ + GLuint shader = gl_CreateShader (type); + gl_ShaderSource (shader, count, string, NULL); + compileAndCheck (shader); + return shader; +} + +void linkAndCheck(GLuint program) +{ + GLint status; + gl_LinkProgram (program); + gl_GetProgramiv (program, GL_LINK_STATUS, &status); + if (status == GL_FALSE) { + GLint infoLogLength; + GLchar *infoLog; + gl_GetProgramiv (program, GL_INFO_LOG_LENGTH, &infoLogLength); + infoLog = (GLchar*) malloc (infoLogLength); + gl_GetProgramInfoLog (program, infoLogLength, NULL, infoLog); + fprintf (stderr, "link log: %s\n", infoLog); + free (infoLog); + } +} + +GLuint createProgram(GLuint vertexShader, GLuint fragmentShader) +{ + GLuint program = gl_CreateProgram (); + if (vertexShader != 0) { + gl_AttachShader (program, vertexShader); + } + if (fragmentShader != 0) { + gl_AttachShader (program, fragmentShader); + } + linkAndCheck (program); + return program; +} + +void initShader(void) +{ + const GLsizei vertexShaderLines = sizeof(vertexShaderSource) / sizeof(GLchar*); + GLuint vertexShader = + compileShaderSource (GL_VERTEX_SHADER, vertexShaderLines, vertexShaderSource); + + const GLsizei fragmentShaderLines = sizeof(fragmentShaderSource) / sizeof(GLchar*); + GLuint fragmentShader = + compileShaderSource (GL_FRAGMENT_SHADER, fragmentShaderLines, fragmentShaderSource); + + GLuint program = createProgram (vertexShader, fragmentShader); + gl_UseProgram (program); + checkError ("initShader"); +} + void initRendering(void) { glClearColor (0.0, 0.0, 0.0, 0.0); @@ -117,9 +270,19 @@ void initRendering(void) void init(void) { - initExtensionEntries(); - initBuffer(); - initRendering(); + initExtensionEntries (); + initBuffer (); + initShader (); + initRendering (); +} + +void dumpInfo(void) +{ + printf ("Vendor: %s\n", glGetString (GL_VENDOR)); + printf ("Renderer: %s\n", glGetString (GL_RENDERER)); + printf ("Version: %s\n", glGetString (GL_VERSION)); + printf ("GLSL: %s\n", glGetString (GL_SHADING_LANGUAGE_VERSION)); + checkError ("dumpInfo"); } const GLvoid *bufferObjectPtr (GLsizei index) @@ -210,6 +373,7 @@ int main(int argc, char** argv) glutInitWindowSize (500, 500); glutInitWindowPosition (100, 100); glutCreateWindow (argv[0]); + dumpInfo (); init (); glutDisplayFunc(display); glutReshapeFunc(reshape);