tests/spec/arb_viewport_array/render_depthrange.c

   1 /*
   2  * Copyright © 2013 LunarG, Inc.
   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: Jon Ashburn <jon@lunarg.com>
  24  */
  25
  26 /**
  27  * Draws quads into a single framebuffer surface with multiple viewports
  28  * via a geometry shader.  Each different viewport has a different DepthRange.
  29  * The fragment shader outputs a color based on the depthRange, z, and viewport
  30  * index. Confirm that each quad has the correct color and therefore has
  31  * the correct depthRange for that viewport index.
  32  * From the OpenGL 4.3 Core3 Profile Spec section 13.6:
  33  *     "DepthRangeIndexed specifies the depth range for a single viewport and
  34  *     is equivalent (assuming no errors are generated) to:
  35  *         double v[] = { n, f };
  36  *         DepthRangeArrayv(index, 1, v);"
  37  *     "DepthRange sets the depth range for all viewports to the same values
  38  *     and is equivalent (assuming no errors are generated) to:
  39  *         for (uint i = 0; i < MAX_VIEWPORTS; i++)
  40  *         DepthRangeIndexed(i, n, f );"
  41  */
  42 #include "piglit-util-gl.h"
  43
  44 PIGLIT_GL_TEST_CONFIG_BEGIN
  45
  46         config.supports_gl_compat_version = 32;
  47         config.supports_gl_core_version = 32;
  48         config.supports_gl_es_version = 31;
  49
  50         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  51         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  52
  53 PIGLIT_GL_TEST_CONFIG_END
  54
  55 #ifdef PIGLIT_USE_OPENGL
  56 #define GLSL_VERSION "150"
  57 #else
  58 #define GLSL_VERSION "310 es"
  59 #endif
  60
  61 const char *vsSource = {
  62         "#version " GLSL_VERSION "\n"
  63         "in vec4 piglit_vertex;\n"
  64         "void main() {\n"
  65         "       gl_Position = piglit_vertex;\n"
  66         "}\n"
  67 };
  68
  69 const char *gsSource = {
  70         "#version " GLSL_VERSION "\n"
  71         "#extension GL_ARB_viewport_array : enable\n"
  72         "#extension GL_OES_viewport_array : enable\n"
  73         "#extension GL_EXT_geometry_shader : enable\n"
  74         "#extension GL_OES_geometry_shader : enable\n"
  75         "layout(triangles) in;\n"
  76         "layout(triangle_strip, max_vertices = 3) out;\n"
  77         "uniform int idx;\n"
  78         "flat out int ViewportIndex;\n"
  79         "\n"
  80         "void main()\n"
  81         "{\n"
  82         "       gl_ViewportIndex = idx;\n"
  83         "       ViewportIndex = idx;\n"
  84         "       for(int i = 0; i < gl_in.length(); i++) {\n"
  85         "               gl_Position = gl_in[i].gl_Position;\n"
  86         "               EmitVertex();\n"
  87         "       }\n"
  88         "       EndPrimitive();\n"
  89         "}\n"
  90 };
  91
  92 const char *fsSource = {
  93         "#version " GLSL_VERSION "\n"
  94         "#ifdef GL_ES\n"
  95         "precision highp float;\n"
  96         "#endif\n"
  97         "uniform vec3 color;\n"
  98         "flat in int ViewportIndex;\n"
  99         "out vec4 c;\n"
 100         "void main() {\n"
 101         "       float idx = float(ViewportIndex) / 10.0;\n"
 102         "       c = vec4(gl_FragCoord.z, gl_DepthRange.far, idx, 1.0);\n"
 103         "}\n"
 104 };
 105
 106 static GLint colorLoc;
 107 static GLint vpIndexLoc;
 108
 109 #define DIVX 2
 110 #define DIVY 4
 111
 112 /**
 113  * Draws a single quad into multiple viewport each with a different
 114  * depthRange and fixed Z plane.  Reads back the expected color (which is a
 115  * a function (funcOf(Z, depthRange, viewportIndex)) to test if the drawing
 116  * with different depthRanges per viewport index is correct.
 117  * From GLSL 4.30.6 Spec section 7.4:
 118  *     "Depth range in window coordinates,
 119  *      section 13.6.1 “Controlling the Viewport” in the
 120  *      OpenGL Graphics System Specification.
 121  *      Note: Depth-range state is only for viewport 0."
 122  *
 123  */
 124 static bool
 125 draw_multi_viewport(void)
 126 {
 127         bool pass = true;
 128         int i, j;
 129         GLfloat w = (GLfloat) piglit_width / (GLfloat) DIVX;
 130         GLfloat h = (GLfloat) piglit_height / (GLfloat) DIVY;
 131         GLfloat zVal = 0.25f;
 132         GLfloat drFar = 0.6f;
 133         GLfloat colors[DIVX * DIVY][4];
 134 #ifdef PIGLIT_USE_OPENGL
 135         const GLdouble depthRange[][2] =
 136 #else
 137         const GLfloat depthRange[][2] =
 138 #endif
 139                                    {{0.5, 1.0},
 140                                     {0.0, 0.8},
 141                                     {1.0, 0.75},
 142                                     {0.3, 0.8},
 143                                     {0.7, 0.6},
 144                                     {0.9, 0.1},
 145                                     {0.1, 0.9},
 146                                     {0.2, 0.4}};
 147
 148         assert(ARRAY_SIZE(depthRange) == DIVX*DIVY);
 149
 150         glViewport(0, 0, piglit_width, piglit_height); /* for glClear() */
 151         glClearDepthf(1.0);
 152         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 153         glEnable(GL_DEPTH_TEST);
 154 #ifdef PIGLIT_USE_OPENGL
 155         glDepthRangeIndexed(0, 0.4, drFar);
 156 #else
 157         glDepthRangeIndexedfOES(0, 0.4, drFar);
 158 #endif
 159         glDepthFunc(GL_ALWAYS);
 160
 161         /* initialize expected colors
 162          * Frag shader uses FragCoord.z for the Red, DepthRange[0].far for
 163          * Green color, and Blue is viewportIndex / 10.0
 164          */
 165         for (i = 0; i < DIVX * DIVY; i++) {
 166                 GLfloat nearZ = (GLfloat) depthRange[i][0];
 167                 GLfloat farZ = (GLfloat) depthRange[i][1];
 168                 colors[i][0] = (((farZ - nearZ) * zVal)  + nearZ + farZ) / 2.0f;
 169                 colors[i][1] = drFar;
 170                 colors[i][2] = (GLfloat) (i + 1) / 10.0f;
 171                 colors[i][3] = 1.0;
 172         }
 173
 174         /* draw with varying viewports and depth ranges */
 175         for (i = 0; i < DIVX; i++) {
 176                 for (j = 0; j < DIVY; j++) {
 177                         int p, idx;
 178                         /* start at index 1 instead of zero, since index 0
 179                          *  contains the Frag Shader gl_DepthRange value
 180                          */
 181                         idx = j + 1 + i*DIVY;
 182                         glUniform3fv(colorLoc, 1, &colors[idx-1][0]);
 183                         glUniform1i(vpIndexLoc, idx);
 184                         glViewportIndexedf(idx, i * w, j * h, w, h);
 185 #ifdef PIGLIT_USE_OPENGL
 186                         glDepthRangeIndexed(idx, depthRange[idx-1][0],
 187                                             depthRange[idx-1][1]);
 188 #else
 189                         glDepthRangeIndexedfOES(idx, depthRange[idx-1][0],
 190                                                 depthRange[idx-1][1]);
 191 #endif
 192                         piglit_draw_rect_z(zVal, -1.0, -1.0, 2.0, 2.0);
 193                         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 194                         p = piglit_probe_pixel_rgba(i * w + w/2, j * h + h/2,
 195                                                     &colors[idx-1][0]);
 196                         piglit_present_results();
 197                         if (!p) {
 198                                 printf("Wrong color for viewport i,j %d %d\n",
 199                                        i, j);
 200                                 pass = false;
 201                         }
 202                 }
 203         }
 204         return pass;
 205 }
 206
 207 enum piglit_result
 208 piglit_display(void)
 209 {
 210         bool pass= true;
 211
 212         pass = draw_multi_viewport();
 213         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 214         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 215 }
 216
 217 void
 218 piglit_init(int argc, char **argv)
 219 {
 220         GLuint program;
 221
 222 #ifdef PIGLIT_USE_OPENGL
 223         piglit_require_extension("GL_ARB_viewport_array");
 224 #else
 225         piglit_require_extension("GL_OES_viewport_array");
 226 #endif
 227
 228         program = piglit_build_simple_program_multiple_shaders(
 229                                         GL_VERTEX_SHADER, vsSource,
 230                                         GL_GEOMETRY_SHADER, gsSource,
 231                                         GL_FRAGMENT_SHADER, fsSource,
 232                                         0);
 233         glUseProgram(program);
 234         colorLoc = glGetUniformLocation(program, "color");
 235         vpIndexLoc = glGetUniformLocation(program, "idx");
 236 }