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[Freeglut-cvs] SF.net SVN: freeglut:[777] trunk/freeglut/freeglut/progs/demos/ smooth_opengl3/smooth_opengl3.c
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From: <sp...@us...> - 2009-02-15 17:54:02
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Revision: 777
http://freeglut.svn.sourceforge.net/freeglut/?rev=777&view=rev
Author: spanne
Date: 2009-02-15 17:53:48 +0000 (Sun, 15 Feb 2009)
Log Message:
-----------
Use GLSL shaders (still 1.20, though). Dump GL info.
Modified Paths:
--------------
trunk/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c
Modified: trunk/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c
===================================================================
--- trunk/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c 2009-02-15 14:00:45 UTC (rev 776)
+++ trunk/freeglut/freeglut/progs/demos/smooth_opengl3/smooth_opengl3.c 2009-02-15 17:53:48 UTC (rev 777)
@@ -45,6 +45,7 @@
#include <GL/freeglut.h>
#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
/* report GL errors, if any, to stderr */
void checkError(const char *functionName)
@@ -55,8 +56,28 @@
}
}
-/* 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 @@
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 @@
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);
@@ -117,11 +270,21 @@
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)
{
return (const GLvoid *) (((char *) NULL) + index);
@@ -210,6 +373,7 @@
glutInitWindowSize (500, 500);
glutInitWindowPosition (100, 100);
glutCreateWindow (argv[0]);
+ dumpInfo ();
init ();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
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