tests/spec/gl-3.2/pointsprite-origin.c

   1 /*
   2  * Copyright © 2014 VMware, 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
  24 /**
  25  * With Mac AMD GL OpenGL drivers, the texture coordinate v (in Y-direction)
  26  * is flipped for point sprites.
  27  *
  28  * Known to be
  29  *      -- Present in : ATI HD 6770M on Mac OS X 10.8.4
  30  *      -- Fixed in   : Mac OS 10.9
  31  */
  32
  33
  34 #include "piglit-util-gl.h"
  35
  36 PIGLIT_GL_TEST_CONFIG_BEGIN
  37
  38         config.supports_gl_core_version = 32;
  39         config.supports_gl_compat_version = 32;
  40
  41         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  42         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  43
  44 PIGLIT_GL_TEST_CONFIG_END
  45
  46 #define WIDTH 32
  47 #define HEIGHT 32
  48 #define COLOR_GRAY       0x7F7F7FFF
  49 #define CLEAR_COLOR      0x000033FF
  50
  51 static GLuint prog;
  52
  53 static bool
  54 test_pointsprite_origin(void)
  55 {
  56         const unsigned int numPixels = WIDTH * HEIGHT;
  57         GLuint texData[WIDTH * HEIGHT];
  58         GLuint i, texFbo, fbo, vao;
  59         const float pointSize = WIDTH;
  60         const unsigned char expectedChannelVal = 0.5f / WIDTH * 255.0f + 0.5f;
  61         const unsigned int  expectedTexelColor = expectedChannelVal << 24 |
  62                                                  expectedChannelVal << 16 |
  63                                                  0x0000FFFF;
  64
  65         for (i = 0; i < numPixels; ++i) {
  66                 texData[i] = COLOR_GRAY;
  67         }
  68
  69         /* Create vertex arrays */
  70         glGenVertexArrays(1, &vao);
  71         glBindVertexArray(vao);
  72
  73         /* Create 2D textures */
  74         glGenTextures(1, &texFbo);
  75         glActiveTexture(GL_TEXTURE0);
  76         glBindTexture(GL_TEXTURE_2D, texFbo);
  77         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, WIDTH, HEIGHT, 0,
  78                      GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, texData);
  79
  80         if (!piglit_check_gl_error(GL_NO_ERROR))
  81                 return false;
  82
  83         /* Setup the FBO */
  84         glGenFramebuffers(1, &fbo);
  85         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
  86         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
  87                                GL_TEXTURE_2D, texFbo, 0);
  88         if (glCheckFramebufferStatus(GL_FRAMEBUFFER) !=
  89             GL_FRAMEBUFFER_COMPLETE) {
  90                 printf("incomplete framebuffer at line %d\n", __LINE__);
  91                 return false;
  92         }
  93
  94         glDrawBuffer(GL_COLOR_ATTACHMENT0);
  95         if (glCheckFramebufferStatus(GL_FRAMEBUFFER) !=
  96             GL_FRAMEBUFFER_COMPLETE) {
  97                 printf("incomplete framebuffer at line %d\n", __LINE__);
  98                 return false;
  99         }
 100
 101         /* Clear and draw */
 102         glViewport(0, 0, WIDTH, HEIGHT);
 103         glClearColor(((CLEAR_COLOR >> 24) & 0xFF) / 255.0f,
 104                      ((CLEAR_COLOR >> 16) & 0xFF) / 255.0f,
 105                      ((CLEAR_COLOR >> 8)  & 0xFF) / 255.0f,
 106                      ((CLEAR_COLOR) & 0xFF) / 255.0f);
 107         glClear(GL_COLOR_BUFFER_BIT);
 108         glPointSize(pointSize);
 109         glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
 110         glDrawArrays(GL_POINTS, 0, 1);
 111
 112         /* Read back */
 113         glReadBuffer(GL_COLOR_ATTACHMENT0);
 114         if (glCheckFramebufferStatus(GL_FRAMEBUFFER) !=
 115             GL_FRAMEBUFFER_COMPLETE) {
 116                 printf("incomplete framebuffer at line %d\n", __LINE__);
 117                 return false;
 118         }
 119
 120         /* read color buffer */
 121         glPixelStorei(GL_PACK_ROW_LENGTH, WIDTH);
 122         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 123         memset(texData, 0, sizeof(texData));
 124         glReadPixels(0, 0, WIDTH, HEIGHT,
 125                      GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, texData);
 126
 127         if (texData[0] != expectedTexelColor) {
 128                 printf("At pixel (0,0) expected 0x%x but found 0x%x\n",
 129                         expectedTexelColor, texData[0]);
 130                 /* clean up */
 131                 glDeleteTextures(1, &texFbo);
 132                 glDeleteFramebuffers(1, &fbo);
 133                 return false;
 134         }
 135
 136         if (!piglit_check_gl_error(GL_NO_ERROR))
 137                 return false;
 138
 139         glDeleteTextures(1, &texFbo);
 140         glDeleteFramebuffers(1, &fbo);
 141         return true;
 142 }
 143
 144
 145 static void
 146 setup_shaders(void)
 147 {
 148         static const char *vsSrc =
 149                 "#version 150\n"
 150                 "void main(void) {"
 151                 "   gl_Position = vec4(0, 0, 0, 1);"
 152                 "}";
 153         static const char *fsSrc =
 154                 "#version 150\n"
 155                 "out vec4 fragColor0;"
 156                 "void main(void) {"
 157                 "   fragColor0.xy = gl_PointCoord.xy;"
 158                 "   fragColor0.zw = vec2(1, 1);"
 159                 "}";
 160
 161         /* Create shaders and the program */
 162         prog = piglit_build_simple_program(vsSrc, fsSrc);
 163         glBindFragDataLocation(prog, 0, "fragColor0");
 164         glLinkProgram(prog);
 165         glUseProgram(prog);
 166 }
 167
 168
 169 enum piglit_result
 170 piglit_display(void)
 171 {
 172         bool pass = test_pointsprite_origin();
 173
 174         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 175 }
 176
 177
 178 void
 179 piglit_init(int argc, char **argv)
 180 {
 181         setup_shaders();
 182 }