tests/shaders/glsl-fs-flat-color.c

   1 /*
   2  * Copyright © 2011 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 glsl-fs-flat-color.c
  26  * Test that gl_Color works correctly with GL_SHADE_MODEL of GL_FLAT
  27  */
  28 #include "piglit-util-gl.h"
  29
  30 PIGLIT_GL_TEST_CONFIG_BEGIN
  31
  32         config.supports_gl_compat_version = 10;
  33
  34         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  35         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  36
  37 PIGLIT_GL_TEST_CONFIG_END
  38
  39 GLuint prog;
  40
  41 GLvoid
  42 draw_rect(float x, float y, float w, float h, float *color)
  43 {
  44         float verts[4][4];
  45         float colors[16];
  46
  47         verts[0][0] = x;
  48         verts[0][1] = y;
  49         verts[0][2] = 0.0;
  50         verts[0][3] = 1.0;
  51         verts[1][0] = x + w;
  52         verts[1][1] = y;
  53         verts[1][2] = 0.0;
  54         verts[1][3] = 1.0;
  55         verts[2][0] = x + w;
  56         verts[2][1] = y + h;
  57         verts[2][2] = 0.0;
  58         verts[2][3] = 1.0;
  59         verts[3][0] = x;
  60         verts[3][1] = y + h;
  61         verts[3][2] = 0.0;
  62         verts[3][3] = 1.0;
  63
  64         /* Fill in just the first color.  We're flat shading, after all. */
  65         memset(&colors, 0, sizeof(colors));
  66         memcpy(colors, color, 4 * sizeof(float));
  67
  68         glVertexPointer(4, GL_FLOAT, 0, verts);
  69         glEnableClientState(GL_VERTEX_ARRAY);
  70         glColorPointer(4, GL_FLOAT, 0, colors);
  71         glEnableClientState(GL_COLOR_ARRAY);
  72
  73         glDrawArrays(GL_POLYGON, 0, 4);
  74
  75         glDisableClientState(GL_VERTEX_ARRAY);
  76         glDisableClientState(GL_COLOR_ARRAY);
  77 }
  78
  79 enum piglit_result
  80 piglit_display(void)
  81 {
  82         float green[4] = { 0.0, 1.0, 0.0, 1.0 };
  83         enum piglit_result result = PIGLIT_PASS;
  84
  85         glShadeModel(GL_FLAT);
  86
  87         draw_rect(-1, -1, 2, 2, green);
  88
  89         if (!piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green))
  90                 result = PIGLIT_FAIL;
  91
  92         if (!piglit_automatic)
  93                 piglit_present_results();
  94
  95         return result;
  96 }
  97
  98 void
  99 piglit_init(int argc, char **argv)
 100 {
 101         GLuint vs, fs;
 102
 103         piglit_require_gl_version(20);
 104
 105         vs = piglit_compile_shader(GL_VERTEX_SHADER,
 106                                    "shaders/glsl-color-mvp.vert");
 107         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
 108                                    "shaders/glsl-color.frag");
 109
 110         prog = piglit_link_simple_program(vs, fs);
 111
 112         glDeleteShader(vs);
 113         glDeleteShader(fs);
 114
 115         /* Don't try to render if the program failed to link, and linking
 116          * had better succeed!
 117          */
 118         if (!piglit_link_check_status(prog))
 119                 piglit_report_result(PIGLIT_FAIL);
 120
 121         glUseProgram(prog);
 122 }