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/*
* Copyright © 2012 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 elements.c
*
* Tests that glDrawElementsInstancedARB() can render multiple
* instances and the instance IDs are propagated to the shader.
*
* This is a derivative of instance-array-dereference.c, which uses
* glDrawArraysInstancedARB().
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = 70;
config.window_height = 30;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
static const char *vs_source =
"#version 120\n"
"#extension GL_ARB_draw_instanced: require\n"
"\n"
"uniform vec4 instance_colors[] = vec4[](vec4(0.0, 1.0, 0.0, 1.0),\n"
" vec4(0.0, 1.0, 1.0, 1.0),\n"
" vec4(0.0, 0.0, 1.0, 1.0));\n"
"\n"
"varying vec4 color;\n"
"\n"
"void main()\n"
"{\n"
" color = instance_colors[gl_InstanceIDARB];\n"
"\n"
" vec4 v = gl_Vertex;\n"
" v.x += 20.0 * float(gl_InstanceIDARB);\n"
"\n"
" gl_Position = gl_ModelViewProjectionMatrix * v;\n"
"}\n";
static const char *fs_source =
"varying vec4 color;\n"
"void main()\n"
"{\n"
" gl_FragColor = color;\n"
"}\n";
enum piglit_result
piglit_display(void)
{
static const int indices[6] = {0, 1, 2, 0, 2, 3};
static const float verts[] = {
10, 10,
20, 10,
20, 20,
10, 20,
};
static const float green[4] = {0.0, 1.0, 0.0, 1.0};
static const float cyan[4] = {0.0, 1.0, 1.0, 1.0};
static const float blue[4] = {0.0, 0.0, 1.0, 1.0};
enum piglit_result result = PIGLIT_PASS;
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glClearColor(0.5, 0.5, 0.5, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glVertexPointer(2, GL_FLOAT, 0, verts);
glEnableClientState(GL_VERTEX_ARRAY);
glDrawElementsInstancedARB(GL_TRIANGLES, 6, GL_UNSIGNED_INT,
indices, 3);
glDisableClientState(GL_VERTEX_ARRAY);
if (!piglit_probe_rect_rgba(10, 10, 10, 10, green))
result = PIGLIT_FAIL;
if (!piglit_probe_rect_rgba(30, 10, 10, 10, cyan))
result = PIGLIT_FAIL;
if (!piglit_probe_rect_rgba(50, 10, 10, 10, blue))
result = PIGLIT_FAIL;
piglit_present_results();
return result;
}
void
piglit_init(int argc, char **argv)
{
GLuint vs, fs, prog;
piglit_require_extension("GL_ARB_draw_instanced");
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
prog = piglit_link_simple_program(vs, fs);
if (!vs || !fs || !prog)
piglit_report_result(PIGLIT_FAIL);
glDeleteShader(vs);
glDeleteShader(fs);
glUseProgram(prog);
}
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