tests/spec/arb_viewport_array/render_viewport_2.c

   1 /*
   2  * Copyright © 2015 Red Hat.
   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  */
  24
  25 /**
  26  * Tests rendering into a single framebuffer surface with multiple viewports
  27  * via a geometry shader.
  28  * This test is inspired by a CTS test.
  29  * For one point, the geom shader emits a triangle strip with a color
  30  * pre invocation. The viewports then should get one shade of red lighter.
  31  */
  32 #include "piglit-util-gl.h"
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_compat_version = 32;
  37         config.supports_gl_core_version = 32;
  38         config.supports_gl_es_version = 31;
  39
  40         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  41         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  42
  43 PIGLIT_GL_TEST_CONFIG_END
  44
  45 #ifdef PIGLIT_USE_OPENGL
  46 #define GLSL_VERSION "150"
  47 #else
  48 #define GLSL_VERSION "310 es"
  49 #endif
  50
  51 const char *vsSource = {
  52         "#version " GLSL_VERSION "\n"
  53         "void main() {\n"
  54         "}\n"
  55 };
  56
  57 const char *gsSource = {
  58         "#version " GLSL_VERSION "\n"
  59         "#extension GL_ARB_gpu_shader5 : enable\n"
  60         "#extension GL_ARB_viewport_array : enable\n"
  61         "#extension GL_OES_viewport_array : enable\n"
  62         "#extension GL_EXT_geometry_shader : enable\n"
  63         "#extension GL_OES_geometry_shader : enable\n"
  64         "layout(points, invocations = 16) in;\n"
  65         "layout(triangle_strip, max_vertices = 4) out;\n"
  66         " flat out int gs_fs_color;\n"
  67         "\n"
  68         "void main()\n"
  69         "{\n"
  70         "       gs_fs_color = gl_InvocationID;\n"
  71         "       gl_ViewportIndex = gl_InvocationID;\n"
  72         "       gl_Position = vec4(-1, -1, 0, 1);\n"
  73         "       EmitVertex();\n"
  74         "       gs_fs_color = gl_InvocationID;\n"
  75         "       gl_ViewportIndex = gl_InvocationID;\n"
  76         "       gl_Position = vec4(-1, 1, 0, 1);\n"
  77         "       EmitVertex();\n"
  78         "       gs_fs_color = gl_InvocationID;\n"
  79         "       gl_ViewportIndex = gl_InvocationID;\n"
  80         "       gl_Position = vec4(1, -1, 0, 1);\n"
  81         "       EmitVertex();\n"
  82         "       gs_fs_color = gl_InvocationID;\n"
  83         "       gl_ViewportIndex = gl_InvocationID;\n"
  84         "       gl_Position = vec4(1, 1, 0, 1);\n"
  85         "       EmitVertex();\n"
  86         "}\n"
  87 };
  88
  89 const char *fsSource = {
  90         "#version " GLSL_VERSION "\n"
  91         "#ifdef GL_ES\n"
  92         "precision highp float;\n"
  93         "#endif\n"
  94         "flat in int gs_fs_color;\n"
  95         "uniform vec3 color;\n"
  96         "out vec4 c;\n"
  97         "void main() {\n"
  98         "       c = vec4(1.0 / float(gs_fs_color + 1), 0.0, 0.0, 1.0);\n"
  99         "}\n"
 100 };
 101
 102 static bool
 103 draw_multi_viewport(void)
 104 {
 105         bool pass = true;
 106         int i, j;
 107         const int divX=4, divY=4;
 108         GLfloat w = (GLfloat) piglit_width / (GLfloat) divX;
 109         GLfloat h = (GLfloat) piglit_height / (GLfloat) divY;
 110         GLfloat data[16 * 4 /* 4x4 * (x + y + w + h) */];
 111         int idx;
 112         int p;
 113
 114         idx = 0;
 115         for (i = 0; i < divX; i++) {
 116                 for (j = 0; j < divY; j++) {
 117                         data[idx * 4 + 0] = (GLfloat)(i * w);
 118                         data[idx * 4 + 1] = (GLfloat)(j * h);
 119                         data[idx * 4 + 2] = w;
 120                         data[idx * 4 + 3] = h;
 121                         idx++;
 122                 }
 123         }
 124         glViewport(0, 0, piglit_width, piglit_height); /* for glClear() */
 125         glClear(GL_COLOR_BUFFER_BIT);
 126         glViewportArrayv(0, 16, data);
 127
 128         glDrawArrays(GL_POINTS, 0, 1);
 129         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 130
 131         for (i = 0; i < divX; i++) {
 132                 for (j = 0; j < divY; j++) {
 133                         GLfloat expected[4];
 134
 135                         expected[0] = 1.0 / (1 + i*4 + j);
 136                         expected[1] = 0.0;
 137                         expected[2] = 0.0;
 138                         expected[3] = 1.0;
 139                         p = piglit_probe_pixel_rgba(i * w + w/2, j * h + h /2,
 140                                                     expected);
 141                         if (!p) {
 142                                 printf("Wrong color for viewport i,j %d %d\n",
 143                                        i, j);
 144                                 pass = false;
 145                         }
 146                 }
 147         }
 148
 149         piglit_present_results();
 150
 151         return pass;
 152 }
 153
 154 enum piglit_result
 155 piglit_display(void)
 156 {
 157         bool pass = true;
 158
 159         pass = draw_multi_viewport();
 160         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 161         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 162 }
 163
 164 void
 165 piglit_init(int argc, char **argv)
 166 {
 167         GLuint program;
 168         GLuint vao;
 169
 170 #ifdef PIGLIT_USE_OPENGL
 171         piglit_require_extension("GL_ARB_viewport_array");
 172         piglit_require_extension("GL_ARB_gpu_shader5");
 173 #else
 174         piglit_require_extension("GL_OES_viewport_array");
 175 #endif
 176
 177         program = piglit_build_simple_program_multiple_shaders(
 178                                         GL_VERTEX_SHADER, vsSource,
 179                                         GL_GEOMETRY_SHADER, gsSource,
 180                                         GL_FRAGMENT_SHADER, fsSource,
 181                                         0);
 182         glUseProgram(program);
 183
 184         glGenVertexArrays(1, &vao);
 185         glBindVertexArray(vao);
 186
 187 }