Attachment 36339 Details for Bug 28585 – Test case

Test case

test-egl-vertex-attrib.c (text/x-csrc), 2.82 KB, created by Neil Roberts on 2010-06-17 10:11:59 UTC

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Creator: Neil Roberts

Created: 2010-06-17 10:11:59 UTC

Size: 2.82 KB

patch

obsolete

>#define GL_GLEXT_PROTOTYPES
>#define EGL_EGLEXT_PROTOTYPES
>
>#include <math.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <string.h>
>#include <sys/time.h>
>#include <unistd.h>
>#include <GLES2/gl2.h>
>#include <EGL/egl.h>
>#include <EGL/eglext.h>
>#include "eglut.h"
>
>#define ATTRIB_POSITION 0
>#define ATTRIB_COLOR    1
>
>static const char vertex_shader[] =
>  "attribute vec4 position;\n"
>  "attribute vec4 color_attrib;\n"
>  "varying vec4 frag_color;\n"
>  "\n"
>  "void\n"
>  "main ()\n"
>  "{\n"
>  "  gl_Position = position;\n"
>  "  frag_color = color_attrib;\n"
>  "}\n";
>
>static const char fragment_shader[] =
>  "precision mediump float;\n"
>  "varying vec4 frag_color;\n"
>  "\n"
>  "void\n"
>  "main ()\n"
>  "{\n"
>  "  gl_FragColor = frag_color;\n"
>  "}\n";
>
>static void
>shader_source (GLuint shader, const char *source)
>{
>  GLint length = strlen (source);
>
>  glShaderSource (shader, 1, &source, &length);
>}
>
>static void
>test_init (void)
>{
>  GLuint shader, program;
>  char buf[512];
>
>  program = glCreateProgram ();
>
>  shader = glCreateShader (GL_VERTEX_SHADER);
>  shader_source (shader, vertex_shader);
>  glCompileShader (shader);
>  glGetShaderInfoLog (shader, sizeof (buf), NULL, buf);
>  printf ("vertex shader info: %s\n", buf);
>  glAttachShader (program, shader);
>
>  shader = glCreateShader (GL_FRAGMENT_SHADER);
>  shader_source (shader, fragment_shader);
>  glCompileShader (shader);
>  glGetShaderInfoLog (shader, sizeof (buf), NULL, buf);
>  printf ("fragment shader info: %s\n", buf);
>  glAttachShader (program, shader);
>
>  glBindAttribLocation (program, ATTRIB_POSITION, "position");
>  glBindAttribLocation (program, ATTRIB_COLOR, "color_attrib");
>
>  glLinkProgram (program);
>  glGetProgramInfoLog (program, sizeof (buf), NULL, buf);
>  printf ("info: %s\n", buf);
>
>  glUseProgram (program);
>}
>
>static void
>test_draw (void)
>{
>  GLfloat verts[] =
>    {
>      -0.5f, -0.5f,
>      0.5f, -0.5f,
>      -0.5f, 0.5f,
>      0.5f, 0.5f
>    };
>
>  glClearColor (0.5, 0.5, 1.0, 1.0);
>  glClear (GL_COLOR_BUFFER_BIT);
>
>  glVertexAttribPointer (ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, verts);
>  glEnableVertexAttribArray (ATTRIB_POSITION);
>
>#if 0 /* using a vertex attrib pointer works */
>  {
>    GLfloat colors[] =
>      {
>        1.0f, 0.0f, 0.0f,
>        1.0f, 0.0f, 0.0f,
>        1.0f, 0.0f, 0.0f,
>        1.0f, 0.0f, 0.0f
>      };
>
>    glVertexAttribPointer (ATTRIB_COLOR, 3, GL_FLOAT, GL_FALSE, 0, colors);
>    glEnableVertexAttribArray (ATTRIB_COLOR);
>  }
>#else /* using the vertex attrib state does not */
>
>  glVertexAttrib3f (ATTRIB_COLOR, 1.0f, 0.0f, 0.0f);
>
>#endif
>
>  glDrawArrays (GL_TRIANGLE_STRIP, 0, 4);
>}
>
>int
>main (int argc, char **argv)
>{
>  eglutInitWindowSize (300, 300);
>  eglutInitAPIMask (EGLUT_OPENGL_ES2_BIT);
>  eglutInit (argc, argv);
>
>  eglutCreateWindow ("test-gl-vertex-attrib");
>
>  eglutDisplayFunc (test_draw);
>
>  test_init ();
>
>  eglutMainLoop ();
>
>  return 0;
>}

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Attachments on bug 28585: 36339 | 40868

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