tests/spec/arb_texture_view/sampling-2d-array-as-2d-layer.c

   1 /*
   2  * Copyright © 2015 Glenn Kennard
   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 DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Author: Glenn Kennard <glenn.kennard@gmail.com>
  24  */
  25
  26 /**
  27  * \file sampling-2d-array-as-2d-layer.c
  28  * This tests that you can cast from a 2D Array texture to a regular 2D texture
  29  * with layer>0 and sample from the latter.
  30  */
  31
  32 #include "piglit-util-gl.h"
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35         config.supports_gl_compat_version = 30;
  36         config.supports_gl_es_version = 31;
  37         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  38         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  39
  40 PIGLIT_GL_TEST_CONFIG_END
  41
  42 static const GLubyte green[] = {0, 255, 0, 255};
  43 static const float greenf[] = {0, 1.0f, 0, 1.0f};
  44 static const GLubyte red[] = {255, 0, 0, 255};
  45
  46 typedef struct Params {
  47         int num_layers;
  48         int width;
  49         int height;
  50         const char * const desc;
  51 } Params;
  52
  53 /* test a few size combinations that tend to require particular alignment
  54    requirements by the hardware */
  55 static const Params testparams[] = {
  56         { 8, 1, 1, "1x1" },
  57         { 3, 2, 1, "2x1" },
  58         { 3, 8, 1, "8x1" },
  59         { 1, 16, 1, "16x1" },
  60         { 5, 1, 16, "1x16" },
  61         { 9, 32, 32, "32x32" },
  62         { 2, 64, 64, "64x64" },
  63         { 4, 128, 64, "128x64" },
  64         { 3, 35, 67, "35x67" }
  65 };
  66
  67 static GLubyte *makesolidimage(int w, int h, const GLubyte color[4])
  68 {
  69         GLubyte *p = malloc(w * h * 4 * sizeof(GLubyte));
  70         size_t n;
  71         assert(p);
  72         for (n = 0; n < w * h; n++) {
  73                 p[n*4 + 0] = color[0];
  74                 p[n*4 + 1] = color[1];
  75                 p[n*4 + 2] = color[2];
  76                 p[n*4 + 3] = color[3];
  77         }
  78         return p;
  79 }
  80
  81 static bool
  82 test_single_layer(const Params* p, int layer)
  83 {
  84         int l;
  85         GLuint tex_src, tex_view;
  86         GLboolean pass;
  87         GLubyte *image;
  88
  89         assert(layer < p->num_layers);
  90
  91         glGenTextures(1, &tex_src);
  92         glBindTexture(GL_TEXTURE_2D_ARRAY, tex_src);
  93
  94         glTexStorage3D(GL_TEXTURE_2D_ARRAY, 1, GL_RGBA8, p->width, p->height, p->num_layers);
  95
  96         /* load each array layer with red */
  97         image = makesolidimage(p->width, p->height, red);
  98         for (l = 0; l < p->num_layers; l++) {
  99                 glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, l,
 100                                 p->width, p->height, 1, GL_RGBA, GL_UNSIGNED_BYTE, image);
 101         }
 102
 103         /* make layer to check red, but green for pixel at (0,0) which should be the only one sampled */
 104         memcpy(image, green, sizeof(green));
 105
 106         glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, layer,
 107                         p->width, p->height, 1, GL_RGBA, GL_UNSIGNED_BYTE, image);
 108
 109         free(image);
 110
 111         glGenTextures(1, &tex_view);
 112         /* checked layer is supposed to be green */
 113         glTextureView(tex_view, GL_TEXTURE_2D, tex_src, GL_RGBA8,
 114                       0, 1, layer, 1);
 115         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 116         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 117         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 118         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 119
 120         glBindTexture(GL_TEXTURE_2D, tex_view);
 121
 122         /* draw it! */
 123         piglit_draw_rect(-1, -1, 2, 2);
 124
 125         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, greenf);
 126         if (!pass) {
 127                 printf("layer %d failed\n", layer);
 128         }
 129
 130         glDeleteTextures(1, &tex_view);
 131         glDeleteTextures(1, &tex_src);
 132
 133         return pass;
 134 }
 135
 136 enum piglit_result
 137 piglit_display(void)
 138 {
 139         GLboolean pass = GL_TRUE;
 140         size_t n;
 141         int layer;
 142
 143         glViewport(0, 0, piglit_width, piglit_height);
 144         glClearColor(0.0, 0.0, 1.0, 1.0);
 145
 146         for (n = 0; n < ARRAY_SIZE(testparams); n++) {
 147                 GLboolean subtest_pass = GL_TRUE;
 148                 for (layer = 0; layer < testparams[n].num_layers; layer++) {
 149                         glClear(GL_COLOR_BUFFER_BIT);
 150
 151                         subtest_pass &= test_single_layer(&testparams[n], layer);
 152                 }
 153                 piglit_report_subtest_result(subtest_pass ? PIGLIT_PASS : PIGLIT_FAIL,
 154                         "%s", testparams[n].desc);
 155                 pass &= subtest_pass;
 156         }
 157
 158         piglit_present_results();
 159
 160         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 161 }
 162
 163 #ifdef PIGLIT_USE_OPENGL
 164 #define GLSL_VERSION "130"
 165 #else
 166 #define GLSL_VERSION "310 es"
 167 #endif
 168
 169 static const char *vs =
 170         "#version " GLSL_VERSION "\n"
 171         "in vec4 piglit_vertex;\n"
 172         "void main() { \n"
 173         "       gl_Position = piglit_vertex;\n"
 174         "}\n";
 175
 176 static const char *fs =
 177         "#version " GLSL_VERSION "\n"
 178         "#ifdef GL_ES\n"
 179         "precision highp float;\n"
 180         "precision highp sampler2D;\n"
 181         "#endif\n"
 182         "uniform sampler2D tex;\n"
 183         "out vec4 color;\n"
 184         "void main() { \n"
 185         "       ivec2 size = textureSize(tex, 0);\n"
 186         /* texel in (0,0) should be the only green texel in the entire texture */
 187         "       vec2 offset = vec2(0.5/float(size.x), 0.5/float(size.y));\n"
 188         "       color = vec4(texture(tex, offset).xyz, 1.0);\n"
 189         "}\n";
 190
 191 void
 192 piglit_init(int argc, char **argv)
 193 {
 194         int tex_loc_view, prog_view;
 195
 196 #ifdef PIGLIT_USE_OPENGL
 197         piglit_require_extension("GL_ARB_texture_view");
 198         piglit_require_extension("GL_ARB_texture_storage");
 199 #else
 200         piglit_require_extension("GL_OES_texture_view");
 201 #endif
 202
 203         /* setup shaders and program object for texture rendering */
 204         prog_view = piglit_build_simple_program(vs, fs);
 205         tex_loc_view = glGetUniformLocation(prog_view, "tex");
 206
 207         glUseProgram(prog_view);
 208         glDeleteProgram(prog_view);
 209         glUniform1i(tex_loc_view, 0);
 210 }