tests/spec/arb_draw_instanced/execution/elements.c

   1 /*
   2  * Copyright © 2012 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 elements.c
  26  *
  27  * Tests that glDrawElementsInstancedARB() can render multiple
  28  * instances and the instance IDs are propagated to the shader.
  29  *
  30  * This is a derivative of instance-array-dereference.c, which uses
  31  * glDrawArraysInstancedARB().
  32  */
  33
  34 #include "piglit-util-gl.h"
  35
  36 PIGLIT_GL_TEST_CONFIG_BEGIN
  37
  38         config.supports_gl_compat_version = 10;
  39         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  40         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  41
  42 PIGLIT_GL_TEST_CONFIG_END
  43
  44 static const char *vs_source =
  45         "#version 120\n"
  46         "#extension GL_ARB_draw_instanced: require\n"
  47         "\n"
  48         "uniform vec4 instance_colors[] = vec4[](vec4(0.0, 1.0, 0.0, 1.0),\n"
  49         "                                        vec4(0.0, 1.0, 1.0, 1.0),\n"
  50         "                                        vec4(0.0, 0.0, 1.0, 1.0));\n"
  51         "\n"
  52         "varying vec4 color;\n"
  53         "\n"
  54         "void main()\n"
  55         "{\n"
  56         "  color = instance_colors[gl_InstanceIDARB];\n"
  57         "\n"
  58         "  vec4 v = gl_Vertex;\n"
  59         "  v.x += 20.0 * float(gl_InstanceIDARB);\n"
  60         "\n"
  61         "  gl_Position = gl_ModelViewProjectionMatrix * v;\n"
  62         "}\n";
  63
  64 static const char *fs_source =
  65         "varying vec4 color;\n"
  66         "void main()\n"
  67         "{\n"
  68         "  gl_FragColor = color;\n"
  69         "}\n";
  70
  71 enum piglit_result
  72 piglit_display(void)
  73 {
  74         static const int indices[6] = {0, 1, 2, 0, 2, 3};
  75         static const float verts[] = {
  76                 10, 10,
  77                 20, 10,
  78                 20, 20,
  79                 10, 20,
  80         };
  81         static const float green[4] = {0.0, 1.0, 0.0, 1.0};
  82         static const float cyan[4]  = {0.0, 1.0, 1.0, 1.0};
  83         static const float blue[4]  = {0.0, 0.0, 1.0, 1.0};
  84         enum piglit_result result = PIGLIT_PASS;
  85
  86         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  87
  88         glViewport(0, 0, piglit_width, piglit_height);
  89
  90         glClearColor(0.5, 0.5, 0.5, 0.0);
  91         glClear(GL_COLOR_BUFFER_BIT);
  92
  93         glVertexPointer(2, GL_FLOAT, 0, verts);
  94         glEnableClientState(GL_VERTEX_ARRAY);
  95         glDrawElementsInstancedARB(GL_TRIANGLES, 6, GL_UNSIGNED_INT,
  96                                    indices, 3);
  97         glDisableClientState(GL_VERTEX_ARRAY);
  98
  99         if (!piglit_probe_rect_rgba(10, 10, 10, 10, green))
 100                 result = PIGLIT_FAIL;
 101
 102         if (!piglit_probe_rect_rgba(30, 10, 10, 10, cyan))
 103                 result = PIGLIT_FAIL;
 104
 105         if (!piglit_probe_rect_rgba(50, 10, 10, 10, blue))
 106                 result = PIGLIT_FAIL;
 107
 108         piglit_present_results();
 109
 110         return result;
 111 }
 112
 113 void
 114 piglit_init(int argc, char **argv)
 115 {
 116         GLuint prog;
 117
 118         piglit_require_extension("GL_ARB_draw_instanced");
 119
 120         prog = piglit_build_simple_program(vs_source, fs_source);
 121
 122         glUseProgram(prog);
 123 }