tests/spec/arb_tessellation_shader/immediate-mode-draw-patches.c

   1 /*
   2  * Copyright © 2018 Timothy Arceri
   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 immediate mode can draw GL_PATCHES.
  26  */
  27
  28 #include "piglit-util-gl.h"
  29
  30 PIGLIT_GL_TEST_CONFIG_BEGIN
  31         config.supports_gl_compat_version = 32;
  32         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  33         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  34 PIGLIT_GL_TEST_CONFIG_END
  35
  36 unsigned int prog;
  37
  38 static const char *const vs_source =
  39 "#version 150 compatibility\n"
  40 "in vec4 piglit_vertex;\n"
  41 "void main() { gl_Position = piglit_vertex; }\n";
  42
  43 static const char *const tcs_source =
  44 "#version 150 compatibility\n"
  45 "#extension GL_ARB_tessellation_shader: require\n"
  46 "layout(vertices = 3) out;\n"
  47 "out vec4 color[];\n"
  48 "void main() {\n"
  49 "       gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;\n"
  50 "       gl_TessLevelOuter = float[4](1.0, 1.0, 1.0, 0.0);\n"
  51 "       gl_TessLevelInner = float[2](0.0, 0.0);\n"
  52 "       color[gl_InvocationID] = vec4(0, 1, 0, 1);\n"
  53 "}\n";
  54
  55 static const char *const tes_source =
  56 "#version 150 compatibility\n"
  57 "#extension GL_ARB_tessellation_shader: require\n"
  58 "layout(triangles) in;\n"
  59 "in vec4 color[];\n"
  60 "void main() { \n"
  61 "       gl_Position = gl_in[0].gl_Position * gl_TessCoord[0]\n"
  62 "                   + gl_in[1].gl_Position * gl_TessCoord[1]\n"
  63 "                   + gl_in[2].gl_Position * gl_TessCoord[2];\n"
  64 "\n"
  65 "       gl_FrontColor = color[0] * gl_TessCoord[0]\n"
  66 "                  + color[1] * gl_TessCoord[1]\n"
  67 "                  + color[2] * gl_TessCoord[2];\n"
  68 "}\n";
  69
  70 enum piglit_result
  71 piglit_display(void)
  72 {
  73         static const GLfloat green[4] = { 0, 1, 0, 1 };
  74         enum piglit_result result;
  75
  76         glClearColor(0.1, 0.1, 0.1, 0.1);
  77         glClear(GL_COLOR_BUFFER_BIT);
  78
  79         glBegin(GL_PATCHES);
  80         glVertex2f(-1.0, -1.0);
  81         glVertex2f(1.0, -1.0);
  82         glVertex2f(-1.0, 1.0);
  83         glVertex2f(-1.0, 1.0);
  84         glVertex2f(1.0, -1.0);
  85         glVertex2f(1.0, 1.0);
  86         glEnd();
  87
  88         if (piglit_probe_pixel_rgb(piglit_width-1, piglit_height-1, green))
  89                 result = PIGLIT_PASS;
  90         else
  91                 result = PIGLIT_FAIL;
  92
  93         if (!piglit_check_gl_error(GL_NO_ERROR))
  94                 result = PIGLIT_FAIL;
  95
  96         return result;
  97 }
  98
  99 void
 100 piglit_init(int argc, char **argv)
 101 {
 102         piglit_require_extension("GL_ARB_tessellation_shader");
 103
 104         prog = piglit_build_simple_program_multiple_shaders(
 105                         GL_VERTEX_SHADER, vs_source,
 106                         GL_TESS_CONTROL_SHADER, tcs_source,
 107                         GL_TESS_EVALUATION_SHADER, tes_source,
 108                         0);
 109
 110         glUseProgram(prog);
 111 }