Attachment 83311 Details for Bug 67548 – Test case

Test case

attrib-location.c (text/plain), 3.37 KB, created by Neil Roberts on 2013-07-30 16:50:15 UTC

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Creator: Neil Roberts

Created: 2013-07-30 16:50:15 UTC

Size: 3.37 KB

patch

obsolete

>#include <GL/glew.h>
>#include <GL/freeglut.h>
>#include <GL/gl.h>
>#include <stdio.h>
>#include <string.h>
>
>typedef struct
>{
>  float x, y;
>  GLubyte r, g, b, a;
>} Vert;
>
>static const GLchar
>vert_shader_source[] =
>  "attribute vec4 other_color;\n"
>  "attribute vec4 pos;\n"
>  "attribute vec4 color;\n"
>  "\n"
>  "void\n"
>  "main ()\n"
>  "{\n"
>  "  gl_Position = pos;\n"
>  "  gl_FrontColor = color + other_color;\n"
>  "}\n";
>
>static const GLchar
>frag_shader_source[] =
>  "\n"
>  "void\n"
>  "main ()\n"
>  "{\n"
>  "  gl_FragColor = gl_Color;\n"
>  "}\n";
>
>static void
>display_cb (void)
>{
>  static const Vert verts[] =
>    {
>      { -0.5, -0.5, 255, 0, 0, 255 },
>      { 0.5, -0.5, 0, 255, 0, 255 },
>      { -0.5, 0.5, 255, 0, 0, 255 },
>      { 0.5, 0.5, 0, 255, 0, 255 }
>    };
>  const GLchar *source;
>  GLint status;
>  GLuint shader;
>  GLuint glsl_program;
>  char buf[1024];
>  GLint pos_location;
>  GLint color_location;
>  GLint other_color_location;
>
>  glClear (GL_COLOR_BUFFER_BIT);
>
>  glsl_program = glCreateProgram ();
>
>  shader = glCreateShader (GL_VERTEX_SHADER);
>  source = vert_shader_source;
>  glShaderSource (shader, 1, &source, 0);
>  glCompileShader (shader);
>  glGetShaderInfoLog (shader, sizeof (buf), NULL, buf);
>  if (*buf)
>    printf ("vertex shader info: %s\n", buf);
>  glGetShaderiv (shader, GL_COMPILE_STATUS, &status);
>  if (!status)
>    printf ("vertex shader compile failed\n");
>  glAttachShader (glsl_program, shader);
>
>  shader = glCreateShader (GL_FRAGMENT_SHADER);
>  source = frag_shader_source;
>  glShaderSource (shader, 1, &source, 0);
>  glCompileShader (shader);
>  glGetShaderInfoLog (shader, sizeof (buf), NULL, buf);
>  if (*buf)
>    printf ("fragment shader info: %s\n", buf);
>  glGetShaderiv (shader, GL_COMPILE_STATUS, &status);
>  if (!status)
>    printf ("fragment shader compile failed\n");
>  glAttachShader (glsl_program, shader);
>
>  glLinkProgram (glsl_program);
>  glUseProgram (glsl_program);
>
>  pos_location = glGetAttribLocation (glsl_program, "pos");
>  printf ("glGetAttribLocation(\"pos\") = %i\n", pos_location);
>
>  color_location = glGetAttribLocation (glsl_program, "color");
>  printf ("glGetAttribLocation(\"color\") = %i\n", color_location);
>
>  other_color_location = glGetAttribLocation (glsl_program, "other_color");
>  printf ("glGetAttribLocation(\"other_color\") = %i\n", other_color_location);
>
>  glEnableVertexAttribArray (pos_location);
>  glVertexAttribPointer (pos_location,
>                         2,
>                         GL_FLOAT,
>                         GL_FALSE,
>                         sizeof (Vert),
>                         &verts[0].x);
>
>  glEnableVertexAttribArray (color_location);
>  glVertexAttribPointer (color_location,
>                         4,
>                         GL_UNSIGNED_BYTE,
>                         GL_TRUE,
>                         sizeof (Vert),
>                         &verts[0].r);
>
>  glVertexAttrib4f (other_color_location, 0.0f, 0.0f, 1.0f, 0.0f);
>
>  glDrawArrays (GL_TRIANGLE_STRIP, 0, 4);
>
>  glDisableVertexAttribArray (pos_location);
>  glDisableVertexAttribArray (color_location);
>
>  glDeleteShader (shader);
>  glUseProgram (0);
>  glDeleteProgram (glsl_program);
>
>  glutSwapBuffers ();
>}
>
>int
>main (int argc, char **argv)
>{
>  glutInit (&argc, argv);
>  glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE);
>  glutInitWindowSize (512, 512);
>  glutCreateWindow ("Look! A triangle!");
>  glutDisplayFunc (display_cb);
>  glewInit ();
>
>  glutMainLoop ();
>
>  return 0;
>}

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