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/*
* Copyright © 2013 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 draw-range-elements-base-vertex.c
*
* Section 2.8.2(Vertex Arrays) From GL spec 3.2 core:
* glDrawRangeElementsBaseVertex was added.
*
* For DrawRangeElementsBaseVertex, the index values must lie between start
* and end inclusive, prior to adding the basevertex offset. Index values
* lying outside the range [start, end] are treated in the same way as
* DrawRangeElements.
*
* It is an error for index values other than the primitive restart index
* to lie outside the range [start, end], but implementations are not
* required to check for this. Such indices will cause implementation-
* dependent behavior.
*
* (0)-------(1) Set up indices for quad 1 and 3.
* | 1 |
* (2)-------(3) Use a basevertex of 2 on quad 3
* | 2 | draw call to shift quad 3 to quad 4
* (4)-------(5)
* | 3 | End result quad 1 will be green and quad 2 blue.
* (6)-------(7) If index values are compared to start and end values
* | 4 | prior to adding basevertex quad 3 will be blue,
* (8)-------(9) while 4 will be green.
*/
#include "piglit-util-gl.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.supports_gl_core_version = 31;
config.window_width = 200;
config.window_height = 200;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
const char *vs_source = {
"#version 130\n"
"in vec2 vertex;\n"
"void main() {\n"
" gl_Position = vec4(vertex.xy, 0, 1);\n"
"}\n"
};
const char *fs_source = {
"#version 130\n"
"void main() {\n"
" gl_FragColor = vec4(0, 1, 0, 1);\n"
"}\n"
};
static GLuint vao;
static GLuint vertexBuffer;
static GLuint indexBuffer;
/* sets of two (x,y) */
static GLfloat vertices[] = {
-1.0, 1.0,
1.0, 1.0,
-1.0, 0.5,
1.0, 0.5,
-1.0, 0.0,
1.0, 0.0,
-1.0,-0.5,
1.0,-0.5,
-1.0,-1.0,
1.0,-1.0
};
static GLsizei vertices_size = sizeof(vertices);
static GLuint indices[] = {
0, 1, 2, 1, 2, 3, /* Top Quad */
4, 5, 6, 5, 6, 7, /* Bot Quad */
};
static GLsizei indices_size = sizeof(indices);
void
piglit_init(int argc, char **argv)
{
GLuint program;
GLuint vertex_index;
if (piglit_get_gl_version() < 32) {
piglit_require_extension("GL_ARB_draw_elements_base_vertex");
piglit_require_GLSL_version(130);
}
/* Create program */
program = piglit_build_simple_program(vs_source, fs_source);
glUseProgram(program);
/* Gen vertex array buffer */
glGenBuffers(1, &vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, vertices_size, vertices, GL_STATIC_DRAW);
/* Gen indices array buffer */
glGenBuffers(1, &indexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices_size,
indices, GL_STATIC_DRAW);
/* Gen VAO */
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
/* Retrieve indices from vs */
vertex_index = glGetAttribLocation(program, "vertex");
/* Enable vertex attrib array */
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glEnableVertexAttribArray(vertex_index);
glVertexAttribPointer(vertex_index, 2, GL_FLOAT, GL_FALSE, 0, 0);
}
enum piglit_result
piglit_display(void)
{
bool pass = true;
float green[] = {0, 1, 0};
float blue[] = {0, 0, 1};
glClearColor(blue[0], blue[1], blue[2], 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glBindVertexArray(vao);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer);
/* Top Quad */
glDrawRangeElementsBaseVertex(GL_TRIANGLES, 0, 3, 6, GL_UNSIGNED_INT,
NULL, 0);
/* Bot Quad */
glDrawRangeElementsBaseVertex(GL_TRIANGLES, 4, 7, 6, GL_UNSIGNED_INT,
(GLvoid *)(sizeof(GLuint)*6), 2);
/* Check for test pass */
pass = piglit_probe_pixel_rgb(100, 175, green) && pass;
pass = piglit_probe_pixel_rgb(100, 125, blue) && pass;
pass = piglit_probe_pixel_rgb(100, 75, blue) && pass;
pass = piglit_probe_pixel_rgb(100, 25, green) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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