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/*
* Copyright © 2014 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/** \file transform-feedback-builtins.c
*
* Intel's i965 driver has a special internal handling for 'gl_Layer' and
* 'gl_ViewportIndex' builtin variables. This test verifies that transform
* feedback works fine for these builtin variables.
*
* Test creates a geometry shader which outputs the following builtin variables:
* - gl_Layer
* - gl_ViewportIndex
*
* Then it verifies that data captured by transform feedback is consistent with
* the assignments in geometry shader.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 32;
config.supports_gl_core_version = 32;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
#define NUM_OUTPUT_INTS 3
static const char *vstext =
"#version 150\n"
"void main()\n"
"{\n"
" gl_Position = vec4(0.0);\n"
"}\n";
static const char *gs_template =
"#version 150\n"
"%s"
"layout(triangles) in;\n"
"layout(triangle_strip, max_vertices = 3) out;\n"
"void main()\n"
"{\n"
" for (int i = 0; i < 3; i++) {\n"
" gl_Layer = 2 * i + 1;\n"
"%s"
" EmitVertex();\n"
" }\n"
" EndPrimitive();\n"
"}\n";
/**
* When below set of varyings are captured from the geometry shader
* above, the output should be a sequence of integers defined in this
* array.
*/
static const int expected[2][3] = {{1, 3, 5}, /* gl_Layer */
{1, 2, 3}}; /* gl_ViewportIndex */
static const char *varyings[] = {"gl_Layer", "gl_ViewportIndex"};
void
piglit_init(int argc, char **argv)
{
int i, j, num_xfb_buffers;
GLuint prog, vao, xfb_buf[2];
const GLint *readback;
char *gstext;
bool pass = true;
bool test_gl_ViewportIndex =
piglit_is_extension_supported("GL_ARB_viewport_array");
num_xfb_buffers = ARRAY_SIZE(xfb_buf);
if (test_gl_ViewportIndex) {
(void)!asprintf(&gstext, gs_template,
"#extension GL_ARB_viewport_array : require\n",
" gl_ViewportIndex = i + 1;\n");
} else {
printf("Skip testing 'gl_ViewportIndex'\n");
(void)!asprintf(&gstext, gs_template, "", "");
num_xfb_buffers -= 1;
}
prog = piglit_build_simple_program_unlinked_multiple_shaders(
GL_VERTEX_SHADER, vstext,
GL_GEOMETRY_SHADER, gstext,
0, NULL);
glTransformFeedbackVaryings(prog, num_xfb_buffers, varyings,
GL_SEPARATE_ATTRIBS);
glLinkProgram(prog);
if (!piglit_link_check_status(prog)) {
glDeleteProgram(prog);
piglit_report_result(PIGLIT_FAIL);
}
glUseProgram(prog);
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
/* Setup transform feedback buffers */
glGenBuffers(num_xfb_buffers, xfb_buf);
for (i = 0; i < num_xfb_buffers; i++) {
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, i, xfb_buf[i]);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER,
NUM_OUTPUT_INTS * sizeof(GLint), NULL,
GL_STATIC_READ);
}
glEnable(GL_RASTERIZER_DISCARD);
/* Do drawing */
glBeginTransformFeedback(GL_TRIANGLES);
glDrawArrays(GL_TRIANGLES, 0, 3);
glEndTransformFeedback();
/* Check if the correct data was written into the transform feedback
* buffers.
*/
for (i = 0; i < num_xfb_buffers; i++) {
glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, xfb_buf[i], 0,
NUM_OUTPUT_INTS * sizeof(GLint));
readback = glMapBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0,
NUM_OUTPUT_INTS * sizeof(GLint),
GL_MAP_READ_BIT);
for (j = 0; j < NUM_OUTPUT_INTS; j++) {
if (readback[j] != expected[i][j]) {
printf("Incorrect data for '%s' output %d."
" Expected %d, got %d.\n", varyings[i],
j, expected[i][j], readback[j]);
pass = false;
}
}
glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER);
}
glDeleteBuffers(num_xfb_buffers, xfb_buf);
/* Check for the errors */
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
enum piglit_result
piglit_display(void)
{
/* Unreached */
return PIGLIT_FAIL;
}
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