tests/spec/gl-1.5/normal3b3s-invariance.c

   1 /*
   2  * Copyright (C) 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  * Test GLbyte[3] and GLshort[3] normal vectors and OpenGL invariance.
  26  *
  27  * We draw a lit, curved surface in two passes.  The first pass draws the
  28  * surface with a blue material and GLfloat[3] normal vectors.  The second
  29  * pass draws the surface with a green material and GLbyte[3] (or GLshort[3])
  30  * normal vectors.  The second pass uses glDepthFunc(GL_EQUAL) and additive
  31  * blending.  So the result should be a cyan surface (blue + green).
  32  *
  33  * If OpenGL uses different vertex transformation paths for the GLfloat[3]
  34  * vs. GLbyte[3] vs. GLshort[3] normal vectors we may get different vertex
  35  * positions, and different fragment Z values, and an unexpected surface color.
  36  *
  37  * Note: we use vertex buffers/arrays and not glNormal3b/3s since the later
  38  * might convert its parameters to floats.
  39  *
  40  * This test hits a VMware svga3d driver issue.
  41  *
  42  * Brian Paul
  43  * 11 April 2014
  44  */
  45
  46 #include "piglit-util-gl.h"
  47
  48
  49 PIGLIT_GL_TEST_CONFIG_BEGIN
  50         config.supports_gl_compat_version = 15;
  51         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DEPTH;
  52         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  53 PIGLIT_GL_TEST_CONFIG_END
  54
  55
  56 struct vertex {
  57         GLfloat pos[3];   /* position */
  58         GLfloat nf[3];    /* float normal */
  59         GLshort ns[3];    /* short normal */
  60         GLbyte nb[3];     /* byte normal */
  61 };
  62
  63
  64 static GLuint NumSections = 60;
  65
  66 static GLenum NormalType = GL_BYTE;
  67
  68 static const float blue[4] = { 0, 0, 1, 0 };
  69 static const float green[4] = { 0, 1, 0, 0 };
  70 static const float black[4] = { 0, 0, 0, 0 };
  71
  72
  73 static GLbyte
  74 float_to_byte(float v)
  75 {
  76         return (GLbyte) (v * 127.0);
  77 }
  78
  79
  80 static GLshort
  81 float_to_short(float v)
  82 {
  83         return (GLshort) (v * 32767.0);
  84 }
  85
  86
  87 /**
  88  * Setup a VBO for a curved surface with vertex positions, float normals
  89  * and byte normals.
  90  */
  91 static void
  92 setup_vbo(void)
  93 {
  94         const float radius = 20.0;
  95         int i, j;
  96         GLuint vbo;
  97         struct vertex *vbo_data;
  98         const unsigned num_verts = (NumSections + 1) * 2;
  99         const unsigned vbo_size = sizeof(struct vertex) * num_verts;
 100
 101         glGenBuffers(1, &vbo);
 102         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 103         glBufferData(GL_ARRAY_BUFFER, vbo_size, NULL, GL_STATIC_DRAW);
 104         vbo_data = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
 105
 106         for (i = j = 0; i <= NumSections; i++) {
 107                 float a = (float) i / (NumSections) * M_PI * 2.0;
 108                 float x = cos(a);
 109                 float z = sin(a);
 110
 111                 vbo_data[j].pos[0] = radius * x;
 112                 vbo_data[j].pos[1] = -10.0;
 113                 vbo_data[j].pos[2] = radius * z;
 114                 vbo_data[j].nf[0] = x;
 115                 vbo_data[j].nf[1] = 0;
 116                 vbo_data[j].nf[2] = z;
 117                 vbo_data[j].nb[0] = float_to_byte(x);
 118                 vbo_data[j].nb[1] = 0;
 119                 vbo_data[j].nb[2] = float_to_byte(z);
 120                 vbo_data[j].ns[0] = float_to_short(x);
 121                 vbo_data[j].ns[1] = 0;
 122                 vbo_data[j].ns[2] = float_to_short(z);
 123                 j++;
 124
 125                 vbo_data[j].pos[0] = radius * x;
 126                 vbo_data[j].pos[1] = 10.0;
 127                 vbo_data[j].pos[2] = radius * z;
 128                 vbo_data[j].nf[0] = x;
 129                 vbo_data[j].nf[1] = 0;
 130                 vbo_data[j].nf[2] = z;
 131                 vbo_data[j].nb[0] = float_to_byte(x);
 132                 vbo_data[j].nb[1] = 0;
 133                 vbo_data[j].nb[2] = float_to_byte(z);
 134                 vbo_data[j].ns[0] = float_to_short(x);
 135                 vbo_data[j].ns[1] = 0;
 136                 vbo_data[j].ns[2] = float_to_short(z);
 137                 j++;
 138         }
 139
 140         glUnmapBuffer(GL_ARRAY_BUFFER);
 141 }
 142
 143
 144 static void
 145 draw_vbo(GLenum normal_type)
 146 {
 147         const unsigned num_verts = (NumSections + 1) * 2;
 148
 149         glVertexPointer(3, GL_FLOAT, sizeof(struct vertex),
 150                         (void *) offsetof(struct vertex, pos));
 151
 152         if (normal_type == GL_BYTE) {
 153                 glNormalPointer(GL_BYTE, sizeof(struct vertex),
 154                                 (void *) offsetof(struct vertex, nb));
 155         }
 156         else if (normal_type == GL_SHORT) {
 157                 glNormalPointer(GL_SHORT, sizeof(struct vertex),
 158                                 (void *) offsetof(struct vertex, ns));
 159         }
 160         else {
 161                 assert(normal_type == GL_FLOAT);
 162                 glNormalPointer(GL_FLOAT, sizeof(struct vertex),
 163                                 (void *) offsetof(struct vertex, nf));
 164         }
 165
 166         glEnable(GL_VERTEX_ARRAY);
 167         glEnable(GL_NORMAL_ARRAY);
 168         glDrawArrays(GL_TRIANGLE_STRIP, 0, num_verts);
 169 }
 170
 171
 172 static bool
 173 draw(void)
 174 {
 175         GLfloat pix[3];
 176         bool pass;
 177
 178         glViewport(0, 0, piglit_width, piglit_height);
 179         glMatrixMode(GL_PROJECTION);
 180         glLoadIdentity();
 181         glFrustum(-1, 1, -1, 1, 2, 200);
 182
 183         glMatrixMode(GL_MODELVIEW);
 184         glLoadIdentity();
 185         glTranslatef(0, -5, -80);
 186
 187         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 188
 189         glEnable(GL_BLEND);
 190
 191         glPushMatrix();
 192         glRotatef(-25, 1, 0, 0);
 193
 194         /* Draw blue base color with glDepthFunc(<=) */
 195         glMaterialfv(GL_FRONT, GL_DIFFUSE, blue);
 196         glDepthFunc(GL_LEQUAL);
 197         draw_vbo(GL_FLOAT);
 198
 199         /* Draw green highlight color with glDepthFunc(==).
 200          * We should generate fragments with the same Z value as the
 201          * first pass.
 202          */
 203         glMaterialfv(GL_FRONT, GL_DIFFUSE, green);
 204         glDepthFunc(GL_EQUAL);
 205         draw_vbo(NormalType);
 206
 207         glPopMatrix();
 208
 209         /* Probe: the center pixel should cyan (blue + green) */
 210         glReadPixels(piglit_width / 2, piglit_height / 2, 1, 1,
 211                      GL_RGB, GL_FLOAT, pix);
 212         pass = (pix[0] == 0.0 &&
 213                 pix[1] >= 0.75 &&
 214                 pix[2] >= 0.75);
 215         if (!pass) {
 216                 printf("Expected (r=0, g>=0.75, b>=0.75), found (%g, %g, %g)\n",
 217                        pix[0], pix[1], pix[2]);
 218         }
 219
 220         piglit_present_results();
 221
 222         return pass;
 223 }
 224
 225
 226 enum piglit_result
 227 piglit_display(void)
 228 {
 229         bool pass = draw();
 230         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 231 }
 232
 233
 234 void
 235 piglit_init(int argc, char **argv)
 236 {
 237         if (argc > 1) {
 238                 if (strcmp(argv[1], "GL_BYTE") == 0) {
 239                         NormalType = GL_BYTE;
 240                 }
 241                 else if (strcmp(argv[1], "GL_SHORT") == 0) {
 242                         NormalType = GL_SHORT;
 243                 }
 244                 else {
 245                         printf("Expected argument GL_BYTE or GL_SHORT\n");
 246                         piglit_report_result(PIGLIT_SKIP);
 247                 }
 248         }
 249
 250
 251         glMaterialfv(GL_FRONT, GL_EMISSION, black);
 252         glMaterialfv(GL_FRONT, GL_DIFFUSE, black);
 253         glMaterialfv(GL_FRONT, GL_SPECULAR, black);
 254         glMaterialf(GL_FRONT, GL_SHININESS, 5);
 255         glLightModelfv(GL_LIGHT_MODEL_AMBIENT, black);
 256
 257         glEnable(GL_LIGHTING);
 258         glEnable(GL_LIGHT0);
 259
 260         glEnable(GL_DEPTH_TEST);
 261
 262         glEnable(GL_CULL_FACE);
 263
 264         glBlendFunc(GL_ONE, GL_ONE);
 265
 266         setup_vbo();
 267 }