tests/fbo/fbo-array.c

   1 /*
   2  * Copyright © 2009 Intel Corporation
   3  * Copyright (c) 2010 VMware, Inc.
   4  * Copyright © 2011 Red Hat Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  23  * IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *     Dave Airlie
  27  *
  28  */
  29
  30 /** @file fbo-array.c
  31  *
  32  * Tests that drawing to each level of an array texture FBO and then drawing views * of those individual depths to the window system framebuffer succeeds.
  33  * based on fbo-3d.c and array-texture.c
  34  */
  35
  36 #include "piglit-util-gl.h"
  37
  38 #define BUF_WIDTH 32
  39 #define BUF_HEIGHT 32
  40
  41 PIGLIT_GL_TEST_CONFIG_BEGIN
  42
  43         config.supports_gl_compat_version = 10;
  44
  45         config.window_width = 200;
  46         config.window_height = 100;
  47         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  48         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  49
  50 PIGLIT_GL_TEST_CONFIG_END
  51
  52 #define NUM_LAYERS      6
  53
  54 float layer_color[NUM_LAYERS][4] = {
  55         {1.0, 0.0, 0.0, 0.0},
  56         {0.0, 1.0, 0.0, 0.0},
  57         {0.0, 0.0, 1.0, 0.0},
  58         {1.0, 0.0, 1.0, 0.0},
  59         {1.0, 1.0, 0.0, 0.0},
  60         {0.0, 1.0, 1.0, 0.0},
  61 };
  62
  63 int num_layers = NUM_LAYERS;
  64
  65 static const char *prog = "fbo-array";
  66 /* debug aid */
  67 static void
  68 check_error(int line)
  69 {
  70    GLenum err = glGetError();
  71    if (err) {
  72       printf("%s: GL error 0x%x at line %d\n", prog, err, line);
  73    }
  74 }
  75
  76 static const char *frag_shader_2d_array_text =
  77    "#extension GL_EXT_texture_array : enable \n"
  78    "uniform sampler2DArray tex; \n"
  79    "void main() \n"
  80    "{ \n"
  81    "   gl_FragColor = texture2DArray(tex, gl_TexCoord[0].xyz); \n"
  82    "} \n";
  83
  84 static GLuint frag_shader_2d_array;
  85 static GLuint program_2d_array;
  86
  87
  88 static int
  89 create_array_fbo(void)
  90 {
  91         GLuint tex, fb;
  92         GLenum status;
  93         int layer;
  94
  95         glGenTextures(1, &tex);
  96         glBindTexture(GL_TEXTURE_2D_ARRAY_EXT, tex);
  97         if (!piglit_check_gl_error(GL_NO_ERROR))
  98                 piglit_report_result(PIGLIT_FAIL);
  99
 100         /* allocate empty array texture */
 101         glTexImage3D(GL_TEXTURE_2D_ARRAY_EXT, 0, GL_RGBA,
 102                      BUF_WIDTH, BUF_HEIGHT, num_layers,
 103                      0,
 104                      GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 105         if (!piglit_check_gl_error(GL_NO_ERROR))
 106                 piglit_report_result(PIGLIT_FAIL);
 107
 108         glGenFramebuffersEXT(1, &fb);
 109         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
 110
 111         /* draw something into each layer of the array texture */
 112         for (layer = 0; layer < NUM_LAYERS; layer++) {
 113                 glFramebufferTextureLayer(GL_FRAMEBUFFER_EXT,
 114                                              GL_COLOR_ATTACHMENT0_EXT,
 115                                              tex,
 116                                              0,
 117                                              layer);
 118
 119                 if (!piglit_check_gl_error(GL_NO_ERROR))
 120                         piglit_report_result(PIGLIT_FAIL);
 121
 122                 status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
 123                 if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 124                         fprintf(stderr, "FBO incomplete\n");
 125                         goto done;
 126                 }
 127
 128                 glViewport(0, 0, BUF_WIDTH, BUF_HEIGHT);
 129                 piglit_ortho_projection(BUF_WIDTH, BUF_HEIGHT, GL_FALSE);
 130
 131                 /* solid color quad */
 132                 glColor4fv(layer_color[layer]);
 133                 piglit_draw_rect(-2, -2, BUF_WIDTH + 2, BUF_HEIGHT + 2);
 134         }
 135
 136
 137 done:
 138         glDeleteFramebuffersEXT(1, &fb);
 139         return tex;
 140 }
 141
 142 /* Draw a textured quad, sampling only the given layer of the
 143  * array texture.
 144  */
 145 static void
 146 draw_layer(int x, int y, int depth)
 147 {
 148         GLfloat depth_coord = (GLfloat)depth;
 149         GLint loc;
 150
 151         glUseProgram(program_2d_array);
 152         loc = glGetUniformLocation(program_2d_array, "tex");
 153         glUniform1i(loc, 0); /* texture unit p */
 154
 155         glViewport(0, 0, piglit_width, piglit_height);
 156         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 157
 158         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
 159
 160         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 161         glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 162         glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 163         glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 164         glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 165         glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 166         glBegin(GL_QUADS);
 167
 168         glTexCoord3f(0, 0, depth_coord);
 169         glVertex2f(x, y);
 170
 171         glTexCoord3f(1, 0, depth_coord);
 172         glVertex2f(x + BUF_WIDTH, y);
 173
 174         glTexCoord3f(1, 1, depth_coord);
 175         glVertex2f(x + BUF_WIDTH, y + BUF_HEIGHT);
 176
 177         glTexCoord3f(0, 1, depth_coord);
 178         glVertex2f(x, y + BUF_HEIGHT);
 179
 180         glEnd();
 181
 182         glUseProgram(0);
 183 }
 184
 185 static GLboolean test_layer_drawing(int start_x, int start_y, float *expected)
 186 {
 187         return piglit_probe_rect_rgb(start_x, start_y, BUF_WIDTH, BUF_HEIGHT,
 188                                      expected);
 189 }
 190
 191 enum piglit_result
 192 piglit_display(void)
 193 {
 194         GLboolean pass = GL_TRUE;
 195         int layer;
 196         GLuint tex;
 197
 198         glClearColor(1.0, 1.0, 1.0, 1.0);
 199         glClear(GL_COLOR_BUFFER_BIT);
 200
 201         tex = create_array_fbo();
 202
 203         for (layer = 0; layer < NUM_LAYERS; layer++) {
 204                 int x = 1 + layer * (BUF_WIDTH + 1);
 205                 int y = 1;
 206                 draw_layer(x, y, layer);
 207         }
 208
 209         for (layer = 0; layer < NUM_LAYERS; layer++) {
 210                 int x = 1 + layer * (BUF_WIDTH + 1);
 211                 int y = 1;
 212                 pass &= test_layer_drawing(x, y, layer_color[layer]);
 213         }
 214
 215         glDeleteTextures(1, &tex);
 216
 217         piglit_present_results();
 218
 219         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 220 }
 221
 222 void piglit_init(int argc, char **argv)
 223 {
 224         piglit_require_extension("GL_EXT_framebuffer_object");
 225         piglit_require_extension("GL_EXT_texture_array");
 226
 227         /* Make shader programs */
 228         frag_shader_2d_array =
 229                 piglit_compile_shader_text(GL_FRAGMENT_SHADER,
 230                                            frag_shader_2d_array_text);
 231         check_error(__LINE__);
 232
 233         program_2d_array = piglit_link_simple_program(0, frag_shader_2d_array);
 234         check_error(__LINE__);
 235
 236 }