tests/shaders/sso-simple.c

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file sso-simple.c
  26  * Simple GL_EXT_separate_shader_objects rendering test
  27  *
  28  * \author Ian Romanick <ian.d.romanick@intel.com>
  29  */
  30 #include "piglit-util-gl.h"
  31
  32 PIGLIT_GL_TEST_CONFIG_BEGIN
  33
  34         config.supports_gl_compat_version = 10;
  35
  36         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  37
  38 PIGLIT_GL_TEST_CONFIG_END
  39
  40 static const char vs_text[] =
  41         "void main() { gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; "
  42         "gl_FrontColor = vec4(0.0, 1.0, 0.0, 1.0); }";
  43
  44 static const char good_fs_text[] =
  45         "void main() { gl_FragColor = gl_Color; }";
  46
  47 /* It is important that this shader *not* use gl_Color.
  48  */
  49 static const char bad_fs_text[] =
  50         "void main() { gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0); }";
  51
  52 static GLuint prog[3];
  53
  54 enum piglit_result
  55 piglit_display(void)
  56 {
  57         static const float green[3] = { 0.0, 1.0, 0.0 };
  58         static const float blue[3]  = { 0.0, 0.0, 1.0 };
  59         enum piglit_result result = PIGLIT_PASS;
  60         float x = 10.0;
  61
  62         glClear(GL_COLOR_BUFFER_BIT);
  63         glColor3fv(blue);
  64
  65         /* Bind the separately linked vertex shader and the separately linked
  66          * fragment shader using the new interfaces.  This should produce a
  67          * green box.
  68          */
  69         glUseShaderProgramEXT(GL_VERTEX_SHADER, prog[0]);
  70         glUseShaderProgramEXT(GL_FRAGMENT_SHADER, prog[1]);
  71         piglit_draw_rect(x, 10, 10, 10);
  72         if (!piglit_probe_pixel_rgb(x + 5, 15, green))
  73                 result = PIGLIT_FAIL;
  74
  75         x += 20.0;
  76
  77         /* Bind the vertex shader that is already linked with a fragment
  78          * shader and the separately linked fragment shader using the new
  79          * interfaces.  This should produce a green box.
  80          *
  81          * If the linked optimized away the vertex shader writes to
  82          * gl_FrontColor (because the fragment shader in prog[2] does not use
  83          * it), this will produce incorrect results.
  84          */
  85         glUseProgram(prog[2]);
  86         glUseShaderProgramEXT(GL_FRAGMENT_SHADER, prog[1]);
  87         piglit_draw_rect(x, 10, 10, 10);
  88         if (!piglit_probe_pixel_rgb(x + 5, 15, green))
  89                 result = PIGLIT_FAIL;
  90
  91         x += 20.0;
  92
  93         /* Unbind any program from the vertex shader stage so that fixed
  94          * function is used.  This should produce the same results as the
  95          * vertex shader except that fixed-function outputs blue.
  96          */
  97         glUseShaderProgramEXT(GL_VERTEX_SHADER, 0);
  98         piglit_draw_rect(x, 10, 10, 10);
  99         if (!piglit_probe_pixel_rgb(x + 5, 15, blue))
 100                 result = PIGLIT_FAIL;
 101
 102         if (!piglit_automatic)
 103                 piglit_present_results();
 104
 105         return result;
 106 }
 107
 108 void
 109 piglit_init(int argc, char **argv)
 110 {
 111         GLuint vs;
 112         GLuint fs;
 113
 114         piglit_require_gl_version(20);
 115
 116         piglit_require_extension("GL_EXT_separate_shader_objects");
 117
 118         glClearColor(0.3, 0.3, 0.3, 0.0);
 119
 120         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 121
 122         vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_text);
 123         fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, bad_fs_text);
 124
 125         prog[0] = piglit_link_simple_program(vs, 0);
 126         prog[1] = glCreateShaderProgramEXT(GL_FRAGMENT_SHADER, good_fs_text);
 127         prog[2] = piglit_link_simple_program(vs, fs);
 128
 129         glDeleteShader(vs);
 130         glDeleteShader(fs);
 131 }