i965g: Remove unnecessary headers.

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

diff --git a/progs/glsl/points.c b/progs/glsl/points.c
index 2dc0670c606f02b63a8dbe6bbd5b4cecf9a1b948..e5ee38c449f1e6585894420384b07b68bd6c78a6 100644 (file)
--- a/progs/glsl/points.c
+++ b/progs/glsl/points.c
@@ -10,10 +10,9 @@
 #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 GLuint FragShader;
@@ -98,7 +97,7 @@ Redisplay(void)
     */
    glPushMatrix();
    glTranslatef(0, 1.2, 0);
-   glUseProgram_func(0);
+   glUseProgram(0);
    DrawPoints(GL_FALSE);
    glPopMatrix();
 
@@ -107,9 +106,9 @@ Redisplay(void)
     */
    glPushMatrix();
    glTranslatef(0, -1.2, 0);
-   glUseProgram_func(Program);
+   glUseProgram(Program);
    if (uViewportInv != -1) {
-      glUniform2f_func(uViewportInv, 1.0 / WinWidth, 1.0 / WinHeight);
+      glUniform2f(uViewportInv, 1.0 / WinWidth, 1.0 / WinHeight);
    }
    DrawPoints(GL_TRUE);
    glPopMatrix();
@@ -149,9 +148,9 @@ Key(unsigned char key, int x, int y)
       Smooth = !Smooth;
       break;
    case 27:
-      glDeleteShader_func(FragShader);
-      glDeleteShader_func(VertShader);
-      glDeleteProgram_func(Program);
+      glDeleteShader(FragShader);
+      glDeleteShader(VertShader);
+      glDeleteProgram(Program);
       glutDestroyWindow(Win);
       exit(0);
    }
@@ -181,47 +180,16 @@ 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);
-   }
-}
-
-
-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)
 {
-   /* Fragment shader: compute distance of fragment from center of point,
-    * if dist > 1, discard
-    * if dist < k, coverage = 1
-    * else, coverage = func(dist)
+   /* Fragment shader: compute distance of fragment from center of point
+    * (we're using texcoords but another varying could be used).
+    *   if dist > 1, discard (coverage==0)
+    *   if dist < k, coverage = 1
+    *   else, coverage = func(dist)
+    * Note: length() uses sqrt() and may be expensive.  The distance could
+    * be squared instead (with adjustments to the threshold (k) test)
     */
    static const char *fragShaderText =
       "void main() {\n"
@@ -238,45 +206,32 @@ Init(void)
       "   gl_FragColor.a = cover; \n"
       "}\n";
    /* Vertex shader: compute new vertex position based on incoming vertex pos,
-    * texcoords and inverse viewport scale factor.
+    * texcoords, point size, and inverse viewport scale factor.
+    * Note: should compute point size attenuation here too.
     */
    static const char *vertShaderText =
       "uniform vec2 viewportInv; \n"
       "void main() {\n"
-      "   vec4 p = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
-      "   vec2 scale2 = viewportInv * gl_Point.size; \n"
-      "   gl_Position.xy = p.xy + gl_MultiTexCoord0.xy * scale2 * p.w; \n"
-      "   gl_Position.zw = p.zw; \n"
+      "   vec4 pos = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+      "   gl_Position.xy = pos.xy + gl_MultiTexCoord0.xy * viewportInv \n"
+      "                    * gl_Point.size * pos.w; \n"
+      "   gl_Position.zw = pos.zw; \n"
       "   gl_TexCoord[0] = gl_MultiTexCoord0; \n"
       "   gl_FrontColor = gl_Color; \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);
-   }
-   printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER));
-
-   GetExtensionFuncs();
-
-   FragShader = glCreateShader_func(GL_FRAGMENT_SHADER);
-   LoadAndCompileShader(FragShader, fragShaderText);
 
-   VertShader = glCreateShader_func(GL_VERTEX_SHADER);
-   LoadAndCompileShader(VertShader, vertShaderText);
+   VertShader = CompileShaderText(GL_VERTEX_SHADER, vertShaderText);
+   FragShader = CompileShaderText(GL_FRAGMENT_SHADER, fragShaderText);
+   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);
 
-   uViewportInv = glGetUniformLocation_func(Program, "viewportInv");
+   uViewportInv = glGetUniformLocation(Program, "viewportInv");
 
-   glUseProgram_func(0);
+   glUseProgram(0);
 
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 }
@@ -289,6 +244,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(WinWidth, WinHeight);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    Win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);