1 /*
2 * Copyright © 2013 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
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 /** @file vertices-in.c
25 *
26 * Check that the built-in geometry shader constant gl_VerticesIn has
27 * the correct value for all input primitive types.
28 *
29 * The test uses transform feedback to extract the value of
30 * gl_VerticesIn out of the shader.
31 */
32
33 #include "piglit-util-gl.h"
34
35 PIGLIT_GL_TEST_CONFIG_BEGIN
36
37 config.supports_gl_compat_version = 30;
38 config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
39
40 PIGLIT_GL_TEST_CONFIG_END
41
42 static const char *vs_text =
43 "#version 130\n"
44 "void main()\n"
45 "{\n"
46 " gl_Position = vec4(0.0);\n"
47 "}\n";
48
49 static const char *gs_text =
50 "#version 130\n"
51 "#extension GL_ARB_geometry_shader4: require\n"
52 "out int vertices_in;\n"
53 "void main()\n"
54 "{\n"
55 " vertices_in = gl_VerticesIn;\n"
56 " EmitVertex();\n"
57 "}\n";
58
59 static const char *varyings[] = { "vertices_in" };
60
61 struct test_vector {
62 GLenum prim_type;
63 GLint vertices_in;
64 } test_vectors[] = {
65 { GL_POINTS, 1},
66 { GL_LINES, 2},
67 { GL_LINES_ADJACENCY, 4},
68 { GL_TRIANGLES, 3},
69 { GL_TRIANGLES_ADJACENCY, 6}
70 };
71
72 void
piglit_init(int argc,char ** argv)73 piglit_init(int argc, char **argv)
74 {
75 GLuint vs, gs, prog, buf;
76 int i;
77 GLint *ptr;
78 bool pass = true;
79
80 /* Requirements */
81 piglit_require_GLSL_version(130);
82 piglit_require_extension("GL_ARB_geometry_shader4");
83 piglit_require_extension("GL_EXT_transform_feedback");
84
85 /* Compile shaders, and prepare for linking. We don't link
86 * yet because we're going to need to change the input
87 * primitive type inside the "for" loop below.
88 */
89 prog = glCreateProgram();
90 vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_text);
91 glAttachShader(prog, vs);
92 gs = piglit_compile_shader_text(GL_GEOMETRY_SHADER, gs_text);
93 glAttachShader(prog, gs);
94 glProgramParameteriARB(prog, GL_GEOMETRY_OUTPUT_TYPE_ARB, GL_POINTS);
95 glProgramParameteriARB(prog, GL_GEOMETRY_VERTICES_OUT_ARB, 1);
96 glTransformFeedbackVaryings(prog, 1, varyings,
97 GL_INTERLEAVED_ATTRIBS_EXT);
98
99 /* Set up the transform feedback buffer. */
100 glGenBuffers(1, &buf);
101 glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, 0, buf);
102 glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, sizeof(GLint), NULL,
103 GL_STREAM_READ);
104
105 /* Use GL_RASTERIZER_DISCARD, since we are going to use
106 * transform feedback for this test.
107 */
108 glEnable(GL_RASTERIZER_DISCARD);
109
110 if (!piglit_check_gl_error(GL_NO_ERROR))
111 piglit_report_result(PIGLIT_FAIL);
112
113 for (i = 0; i < ARRAY_SIZE(test_vectors); i++) {
114 printf("Testing %s:\n",
115 piglit_get_prim_name(test_vectors[i].prim_type));
116 glProgramParameteriARB(prog, GL_GEOMETRY_INPUT_TYPE_ARB,
117 test_vectors[i].prim_type);
118 glLinkProgram(prog);
119 if (!piglit_link_check_status(prog))
120 piglit_report_result(PIGLIT_FAIL);
121 if (!piglit_check_gl_error(GL_NO_ERROR))
122 piglit_report_result(PIGLIT_FAIL);
123 glUseProgram(prog);
124 glBeginTransformFeedback(GL_POINTS);
125 glDrawArrays(test_vectors[i].prim_type, 0,
126 test_vectors[i].vertices_in);
127 glEndTransformFeedback();
128 if (!piglit_check_gl_error(GL_NO_ERROR))
129 piglit_report_result(PIGLIT_FAIL);
130 ptr = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT,
131 GL_READ_ONLY);
132 printf(" Expected gl_VerticesIn = %d, got %d\n",
133 test_vectors[i].vertices_in, *ptr);
134 if (test_vectors[i].vertices_in != *ptr)
135 pass = false;
136 glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT);
137 if (!piglit_check_gl_error(GL_NO_ERROR))
138 piglit_report_result(PIGLIT_FAIL);
139 }
140
141 piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
142 }
143
144
145 enum piglit_result
piglit_display(void)146 piglit_display(void)
147 {
148 /* Should never be reached */
149 return PIGLIT_FAIL;
150 }
151