tests/spec/arb_draw_elements_base_vertex/drawelements-instanced.c

   1 /*
   2  * Copyright © 2009 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  * Authors:
  24  *    Pierre-Eric Pelloux-Prayer <pelloux@gmail.com>
  25  */
  26
  27 /** @file draw-elements-instanced-base-vertex.c
  28  * (Heavily based on draw-elements-base-vertex.c)
  29  * Tests ARB_draw_elements_instanced_base_vertex functionality by drawing a series of
  30  * pairs of quads using different base vertices, using the same vertex and
  31  * index buffers.
  32  * Each pair of quads is drawn using 2 instances, and gl_InstanceID is used as a
  33  * color modifier and an y offset.
  34  */
  35
  36 #include "piglit-util-gl.h"
  37
  38 PIGLIT_GL_TEST_CONFIG_BEGIN
  39
  40         config.supports_gl_compat_version = 10;
  41
  42         config.window_width = 300;
  43         config.window_height = 300;
  44         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  45         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  46
  47 PIGLIT_GL_TEST_CONFIG_END
  48
  49 #define NUM_QUADS  10
  50
  51 static const char *VertShaderText =
  52         "#extension GL_ARB_draw_instanced : enable\n"
  53         "attribute float yOffsetPerInstance; \n"
  54         "void main() \n"
  55         "{\n"
  56         "       vec4 p = gl_Vertex;\n"
  57         "       p.y += yOffsetPerInstance * float(gl_InstanceIDARB);\n"
  58         "       gl_Position = gl_ModelViewProjectionMatrix * p; \n"
  59         "       gl_FrontColor = vec4(1.0-float(gl_InstanceIDARB), 1.0, 1.0, 1.0); \n"
  60         "}\n";
  61
  62 static const char *FragShaderText =
  63         "void main() \n"
  64         "{ \n"
  65         "       gl_FragColor = gl_Color; \n"
  66         "}\n";
  67
  68 static GLuint Program;
  69
  70 static uintptr_t ib_offset;
  71
  72 void
  73 piglit_init(int argc, char **argv)
  74 {
  75         GLfloat *vb;
  76         GLuint *ib;
  77         GLuint vbo;
  78         GLint OffsetAttrib;
  79         GLboolean user_va = GL_FALSE;
  80         int i;
  81
  82         for (i = 1; i < argc; i++) {
  83                 if (!strcmp(argv[i], "user_varrays")) {
  84                         user_va = GL_TRUE;
  85                         puts("Testing user vertex arrays.");
  86                 }
  87         }
  88
  89         piglit_require_vertex_shader();
  90         piglit_require_fragment_shader();
  91         if (!user_va)
  92                 piglit_require_extension("GL_ARB_vertex_buffer_object");
  93         piglit_require_extension("GL_ARB_draw_instanced");
  94         piglit_require_extension("GL_ARB_draw_elements_base_vertex");
  95
  96         glMatrixMode(GL_MODELVIEW);
  97         glPushMatrix();
  98         glLoadIdentity();
  99
 100         if (!user_va) {
 101                 glGenBuffersARB(1, &vbo);
 102                 glBindBufferARB(GL_ARRAY_BUFFER_ARB, vbo);
 103                 glBufferDataARB(GL_ARRAY_BUFFER_ARB,
 104                                 NUM_QUADS * 8 * sizeof(GLfloat) +
 105                                 2 * 4 * sizeof(GLuint),
 106                                 NULL, GL_DYNAMIC_DRAW);
 107                 vb = glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
 108         } else {
 109                 vb = malloc(NUM_QUADS * 8 * sizeof(GLfloat) +
 110                             2 * 4 * sizeof(GLuint));
 111         }
 112
 113         for (i = 0; i < NUM_QUADS; i++) {
 114                 float x1 = 10;
 115                 float y1 = 10 + i * 20;
 116                 float x2 = 20;
 117                 float y2 = 20 + i * 20;
 118
 119                 vb[i * 8 + 0] = x1; vb[i * 8 + 1] = y1;
 120                 vb[i * 8 + 2] = x2; vb[i * 8 + 3] = y1;
 121                 vb[i * 8 + 4] = x2; vb[i * 8 + 5] = y2;
 122                 vb[i * 8 + 6] = x1; vb[i * 8 + 7] = y2;
 123         }
 124         ib_offset = NUM_QUADS * 8 * sizeof(GLfloat);
 125         ib = (GLuint *)((char *)vb + ib_offset);
 126         for (i = 0; i < 8; i++)
 127                 ib[i] = i;
 128
 129         if (user_va) {
 130                 ib_offset = (uintptr_t)ib;
 131         } else {
 132                 glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
 133                 glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, vbo);
 134         }
 135
 136         glEnableClientState(GL_VERTEX_ARRAY);
 137         glVertexPointer(2, GL_FLOAT, 0, user_va ? vb : NULL);
 138
 139         Program = piglit_build_simple_program(VertShaderText, FragShaderText);
 140
 141         glUseProgram(Program);
 142
 143         OffsetAttrib = glGetAttribLocation(Program, "yOffsetPerInstance");
 144         glVertexAttrib1f(OffsetAttrib, 20);
 145 }
 146
 147 enum piglit_result
 148 piglit_display(void)
 149 {
 150         GLboolean pass = GL_TRUE;
 151         float white[3] = {1.0, 1.0, 1.0};
 152         float blue[3]  = {0.0, 1.0, 1.0};
 153         float clear[3] = {0.0, 0.0, 0.0};
 154         int i, j;
 155
 156         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 157
 158         glColor3fv(white);
 159         /* Draw columns with each successive pair of the quads. */
 160         for (i = 0; i < NUM_QUADS - 1; i++) {
 161                 glMatrixMode(GL_PROJECTION);
 162                 glPushMatrix();
 163                 glLoadIdentity();
 164                 glOrtho(0, piglit_width, 0, piglit_height, -1, 1);
 165                 glTranslatef(i * 20, 0, 0);
 166
 167                 glDrawElementsInstancedBaseVertex(GL_QUADS, 4, GL_UNSIGNED_INT,
 168                                                 (void *)(uintptr_t)ib_offset, 2, i * 4);
 169
 170                 glPopMatrix();
 171         }
 172
 173         for (i = 0; i < NUM_QUADS - 1; i++) {
 174                 for (j = 0; j < NUM_QUADS; j++) {
 175                         float *expected;
 176
 177                         int x = 15 + i * 20;
 178                         int y = 15 + j * 20;
 179
 180                         if (j == i)
 181                                 expected = white;
 182                         else if (j == i + 1)
 183                                 expected = blue;
 184                         else
 185                                 expected = clear;
 186                         pass = piglit_probe_pixel_rgb(x, y, expected) && pass;
 187                 }
 188         }
 189
 190         piglit_present_results();
 191
 192         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 193 }