tests/shaders/vp-clipdistance-02.c

   1 /*
   2  * Copyright © 2009 Intel Corporation
   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  * \file vp-clipdistance-02.c
  26  * Test disabling a clip plane, but writing a clip distance for that plane.
  27  *
  28  * For each test square, all of the clip planes except one are enabled.  For
  29  * all of the enabled plane a positive value is written.  For the one disabled
  30  * plane a negative value is written.  No clipping should occur.
  31  *
  32  * \author Ian Romanick <ian.d.romanick@intel.com>
  33  */
  34
  35 #include "piglit-util.h"
  36 #include "piglit-framework.h"
  37
  38 #define ELEMENTS(x)  (sizeof(x) / sizeof(x[0]))
  39
  40 #define TEST_ROWS  1
  41 #define TEST_COLS  6
  42 #define BOX_SIZE   32
  43
  44
  45 int piglit_window_mode = GLUT_DOUBLE;
  46 int piglit_width = (((BOX_SIZE+1)*TEST_COLS)+1);
  47 int piglit_height = (((BOX_SIZE+1)*TEST_ROWS)+1);
  48
  49
  50 static const char vertex_source_template[] =
  51         "!!ARBvp1.0\n"
  52         "OPTION NV_vertex_program2;\n"
  53         "MOV    result.clip[0].x, vertex.texcoord[0].y;\n"
  54         "MOV    result.clip[1].x, vertex.texcoord[0].y;\n"
  55         "MOV    result.clip[2].x, vertex.texcoord[0].y;\n"
  56         "MOV    result.clip[3].x, vertex.texcoord[0].y;\n"
  57         "MOV    result.clip[4].x, vertex.texcoord[0].y;\n"
  58         "MOV    result.clip[5].x, vertex.texcoord[0].y;\n"
  59         "MOV    result.clip[%d].x, vertex.texcoord[0].x;\n"
  60         PIGLIT_VERTEX_PROGRAM_MVP_TRANSFORM
  61         "END\n"
  62         ;
  63
  64 static const char fragment_source[] =
  65         "!!ARBfp1.0\n"
  66         "MOV    result.color, {0.0, 1.0, 0.0, 1.0};\n"
  67         "END"
  68         ;
  69
  70 /**
  71  * \name Handles to programs.
  72  */
  73 /*@{*/
  74 static GLint progs[TEST_COLS];
  75 static GLint frag_prog;
  76 /*@}*/
  77
  78
  79 static const GLfloat clear_color[4] = { 0.5, 0.5, 0.5, 1.0 };
  80
  81
  82 enum piglit_result
  83 piglit_display(void)
  84 {
  85         static const GLfloat color[4] = { 0.0, 1.0, 0.0, 1.0 };
  86         enum piglit_result result = PIGLIT_SUCCESS;
  87         unsigned i;
  88
  89         glClear(GL_COLOR_BUFFER_BIT);
  90
  91         /* Initially, enable all of the clip planes.
  92          */
  93         for (i = 0; i < 6; i++)
  94                 glEnable(GL_CLIP_PLANE0 + i);
  95
  96         for (i = 0; i < ELEMENTS(progs); i++) {
  97                 const int x = 1 + (i * (BOX_SIZE + 1));
  98
  99                 glBindProgramARB(GL_VERTEX_PROGRAM_ARB, progs[i]);
 100                 glDisable(GL_CLIP_PLANE0 + i);
 101                 piglit_draw_rect_tex(x, 1, BOX_SIZE, BOX_SIZE,
 102                                      1.0, 1.0, -2.0, 0.0);
 103                 glEnable(GL_CLIP_PLANE0 + i);
 104
 105                 if (!piglit_probe_pixel_rgb(x + (BOX_SIZE / 2),
 106                                             1 + (BOX_SIZE / 2),
 107                                             color)) {
 108                         result = PIGLIT_FAILURE;
 109                 }
 110         }
 111
 112         glutSwapBuffers();
 113         return result;
 114 }
 115
 116
 117 void
 118 piglit_init(int argc, char **argv)
 119 {
 120         unsigned i;
 121
 122         (void) argc;
 123         (void) argv;
 124
 125         piglit_require_vertex_program();
 126         piglit_require_fragment_program();
 127         piglit_require_extension("GL_NV_vertex_program2_option");
 128         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 129
 130         for (i = 0; i < ELEMENTS(progs); i++) {
 131                 char shader_source[1024];
 132
 133                 snprintf(shader_source, sizeof(shader_source),
 134                          vertex_source_template, i);
 135
 136                 progs[i] = piglit_compile_program(GL_VERTEX_PROGRAM_ARB,
 137                                                   shader_source);
 138         }
 139
 140         glEnable(GL_FRAGMENT_PROGRAM_ARB);
 141         glEnable(GL_VERTEX_PROGRAM_ARB);
 142
 143         frag_prog = piglit_compile_program(GL_FRAGMENT_PROGRAM_ARB,
 144                                            fragment_source);
 145         glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, frag_prog);
 146
 147         glClearColor(clear_color[0],
 148                      clear_color[1],
 149                      clear_color[2],
 150                      clear_color[3]);
 151 }