mesa/st: refactor vertex and fragment shader translation

[mesa.git] / progs / glsl / identity.c

diff --git a/progs/glsl/identity.c b/progs/glsl/identity.c
index a2a19915297d15cf1465b78afaabc614bf8e90fb..526e9b82c10997fb427e8bfe18fcd4f8ac968bfe 100644 (file)
--- a/progs/glsl/identity.c
+++ b/progs/glsl/identity.c
@@ -1,10 +1,6 @@
 /**
  * Test very basic glsl functionality (identity vertex and fragment shaders).
- * Brian Paul
- * 2 May 2007
- *
- * NOTE: resize the window to observe how the partial derivatives of
- * the texcoords change.
+ * Brian Paul & Stephane Marchesin
  */
 
 
@@ -13,10 +9,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
-#include <GL/gl.h>
+#include <GL/glew.h>
 #include <GL/glut.h>
-#include <GL/glext.h>
-#include "extfuncs.h"
+#include "shaderutil.h"
 
 
 static char *FragProgFile = NULL;
@@ -25,10 +20,11 @@ static GLuint fragShader;
 static GLuint vertShader;
 static GLuint program;
 static GLint win = 0;
-static GLboolean anim = GL_TRUE;
+static GLboolean anim = GL_FALSE;
 static GLfloat xRot = 0.0f, yRot = 0.0f;
 static int w,h;
 
+
 static void
 Redisplay(void)
 {
@@ -71,9 +67,9 @@ Reshape(int width, int height)
 static void
 CleanUp(void)
 {
-   glDeleteShader_func(fragShader);
-   glDeleteShader_func(vertShader);
-   glDeleteProgram_func(program);
+   glDeleteShader(fragShader);
+   glDeleteShader(vertShader);
+   glDeleteProgram(program);
    glutDestroyWindow(win);
 }
 
@@ -128,69 +124,6 @@ SpecialKey(int key, int x, int y)
 }
 
 
-
-
-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, "fslight: problem compiling shader:\n%s\n", log);
-      exit(1);
-   }
-}
-
-
-/**
- * Read a shader from a file.
- */
-static void
-ReadShader(GLuint shader, const char *filename)
-{
-   const int max = 100*1000;
-   int n;
-   char *buffer = (char*) malloc(max);
-   FILE *f = fopen(filename, "r");
-   if (!f) {
-      fprintf(stderr, "fslight: Unable to open shader file %s\n", filename);
-      exit(1);
-   }
-
-   n = fread(buffer, 1, max, f);
-   printf("fslight: read %d bytes from shader file %s\n", n, filename);
-   if (n > 0) {
-      buffer[n] = 0;
-      LoadAndCompileShader(shader, buffer);
-   }
-
-   fclose(f);
-   free(buffer);
-}
-
-
-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);
-   }
-}
-
-
 static void
 Init(void)
 {
@@ -202,34 +135,23 @@ Init(void)
       "void main() {\n"
       "   gl_Position = gl_Vertex;\n"
       "}\n";
-   const char *version;
 
-   version = (const char *) glGetString(GL_VERSION);
-   if (version[0] != '2' || version[1] != '.') {
-      printf("This program requires OpenGL 2.x, found %s\n", version);
+   if (!ShadersSupported())
       exit(1);
-   }
 
-   GetExtensionFuncs();
-
-   fragShader = glCreateShader_func(GL_FRAGMENT_SHADER);
    if (FragProgFile)
-      ReadShader(fragShader, FragProgFile);
+      fragShader = CompileShaderFile(GL_FRAGMENT_SHADER, FragProgFile);
    else
-      LoadAndCompileShader(fragShader, fragShaderText);
+      fragShader = CompileShaderText(GL_FRAGMENT_SHADER, fragShaderText);
 
-   vertShader = glCreateShader_func(GL_VERTEX_SHADER);
    if (VertProgFile)
-      ReadShader(vertShader, VertProgFile);
+      vertShader = CompileShaderFile(GL_VERTEX_SHADER, VertProgFile);
    else
-      LoadAndCompileShader(vertShader, vertShaderText);
+      vertShader = CompileShaderText(GL_VERTEX_SHADER, vertShaderText);
+
+   program = LinkShaders(vertShader, fragShader);
 
-   program = glCreateProgram_func();
-   glAttachShader_func(program, fragShader);
-   glAttachShader_func(program, vertShader);
-   glLinkProgram_func(program);
-   CheckLink(program);
-   glUseProgram_func(program);
+   glUseProgram(program);
 
    /*assert(glGetError() == 0);*/
 
@@ -238,9 +160,9 @@ Init(void)
 
    printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER));
 
-   assert(glIsProgram_func(program));
-   assert(glIsShader_func(fragShader));
-   assert(glIsShader_func(vertShader));
+   assert(glIsProgram(program));
+   assert(glIsShader(fragShader));
+   assert(glIsShader(vertShader));
 
    glColor3f(1, 0, 0);
 }
@@ -265,10 +187,10 @@ int
 main(int argc, char *argv[])
 {
    glutInit(&argc, argv);
-   glutInitWindowPosition( 0, 0);
    glutInitWindowSize(200, 200);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);