progs/util: added GetShaderCompile/LinkTime() to get compilation/link times

progs/util/shaderutil.c

@@ -14,6 +14,12 @@
 #include <GL/glut.h>
 #include "shaderutil.h"
 
+/** time to compile previous shader */
+static GLdouble CompileTime = 0.0;
+
+/** time to linke previous program */
+static GLdouble LinkTime = 0.0;
+
 
 GLboolean
 ShadersSupported(void)
@@ -37,10 +43,17 @@ CompileShaderText(GLenum shaderType, const char *text)
 {
    GLuint shader;
    GLint stat;
+   GLdouble t0, t1;
 
    shader = glCreateShader(shaderType);
    glShaderSource(shader, 1, (const GLchar **) &text, NULL);
+
+   t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
    glCompileShader(shader);
+   t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+
+   CompileTime = t1 - t0;
+
    glGetShaderiv(shader, GL_COMPILE_STATUS, &stat);
    if (!stat) {
       GLchar log[1000];
@@ -95,6 +108,7 @@ GLuint
 LinkShaders(GLuint vertShader, GLuint fragShader)
 {
    GLuint program = glCreateProgram();
+   GLdouble t0, t1;
 
    assert(vertShader || fragShader);
 
@@ -102,7 +116,12 @@ LinkShaders(GLuint vertShader, GLuint fragShader)
       glAttachShader(program, fragShader);
    if (vertShader)
       glAttachShader(program, vertShader);
+
+   t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
    glLinkProgram(program);
+   t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
+
+   LinkTime = t1 - t0;
 
    /* check link */
    {
@@ -121,6 +140,20 @@ LinkShaders(GLuint vertShader, GLuint fragShader)
 }
 
 
+GLdouble
+GetShaderCompileTime(void)
+{
+   return CompileTime;
+}
+
+
+GLdouble
+GetShaderLinkTime(void)
+{
+   return LinkTime;
+}
+
+
 void
 SetUniformValues(GLuint program, struct uniform_info uniforms[])
 {