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/*
* Copyright (c) 2010 VMware, Inc.
*
* 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
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, 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
* NON-INFRINGEMENT. IN NO EVENT SHALL VMWARE AND/OR THEIR SUPPLIERS
* 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
* Tests GL_ARB_instanced_arrays
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
500 /*window_width*/,
500 /*window_height*/,
PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA | PIGLIT_GL_VISUAL_DOUBLE)
static const char *TestName = "draw-instanced-arrays";
static GLint PosAttrib, ColorAttrib;
#define PRIMS 8
static const char *VertShaderText =
"attribute vec2 Pos; \n"
"attribute vec4 Color; \n"
"void main() \n"
"{ \n"
" vec4 p = gl_Vertex; \n"
" vec2 pos = Pos; \n"
" p.x += pos.x; \n"
" p.y += pos.y; \n"
" gl_Position = gl_ModelViewProjectionMatrix * p; \n"
" gl_FrontColor = Color; \n"
"} \n";
static const char *FragShaderText =
"void main() \n"
"{ \n"
" gl_FragColor = gl_Color; \n"
"} \n";
static GLuint VertShader, FragShader, Program;
static GLboolean use_vbo = GL_FALSE;
static const GLfloat Positions[PRIMS][2] = {
{ -6, 6 },
{ -4, 4 },
{ -2, 2 },
{ 0, 0 },
{ 2, -2 },
{ 4, -4 },
{ 6, -6 },
{ 8, -8 }
};
static const GLfloat Colors[PRIMS][4] = {
{1, 0, 0, 1},
{0, 1, 0, 1},
{0, 0, 1, 1},
{1, 1, 0, 1},
{0, 1, 1, 1},
{1, 0, 1, 1},
{1, 1, 1, 1},
{0.5, 0.5, 0.5, 1},
};
static GLboolean
test_instancing(GLuint divisor)
{
static const GLfloat verts[4][2] = {
{-1, -1}, {1, -1}, {1, 1}, {-1, 1}
};
GLuint vbo;
uintptr_t offset = 0;
if (use_vbo) {
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER,
sizeof(verts) + sizeof(Positions) + sizeof(Colors),
NULL,
GL_STATIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(verts), verts);
glVertexPointer(2, GL_FLOAT, 0, (void*) offset);
offset += sizeof(verts);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(Positions), Positions);
glVertexAttribPointer(PosAttrib, 2, GL_FLOAT, GL_FALSE, 0, (void*) offset);
offset += sizeof(Positions);
glBufferSubData(GL_ARRAY_BUFFER, offset, sizeof(Colors), Colors);
glVertexAttribPointer(ColorAttrib, 4, GL_FLOAT, GL_FALSE, 0, (void*) offset);
offset += sizeof(Colors);
glBindBuffer(GL_ARRAY_BUFFER, 0);
} else {
glVertexPointer(2, GL_FLOAT, 0, verts);
glVertexAttribPointer(PosAttrib, 2, GL_FLOAT, GL_FALSE, 0, Positions);
glVertexAttribPointer(ColorAttrib, 4, GL_FLOAT, GL_FALSE, 0, Colors);
}
glEnableClientState(GL_VERTEX_ARRAY);
glEnableVertexAttribArray(PosAttrib);
glEnableVertexAttribArray(ColorAttrib);
glVertexAttribDivisorARB(PosAttrib, 1);
/* advance color once every 'n' instances */
glVertexAttribDivisorARB(ColorAttrib, divisor);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(Program);
glDrawArraysInstancedARB(GL_POLYGON, 0, 4, PRIMS);
glUseProgram(0);
if (use_vbo) {
glDeleteBuffers(1, &vbo);
}
{
GLint i;
GLint pos[4];
for (i = 0; i < PRIMS; i++) {
GLuint elem = i / divisor;
/* use glRasterPos to determine where to read a sample pixel */
glRasterPos2fv(Positions[i]);
glGetIntegerv(GL_CURRENT_RASTER_POSITION, pos);
if (!piglit_probe_pixel_rgba(pos[0], pos[1], Colors[elem])) {
fprintf(stderr, "%s: instance %d failed to draw correctly\n",
TestName, i);
fprintf(stderr, "%s: color instance divisor = %u\n",
TestName, divisor);
piglit_present_results();
return GL_FALSE;
}
}
}
glDisableClientState(GL_VERTEX_ARRAY);
glDisableVertexAttribArray(PosAttrib);
glDisableVertexAttribArray(ColorAttrib);
piglit_present_results();
return GL_TRUE;
}
enum piglit_result
piglit_display(void)
{
GLuint div;
for (div = 1; div <= PRIMS; div++) {
if (!test_instancing(div))
return PIGLIT_FAIL;
}
return PIGLIT_PASS;
}
void
piglit_init(int argc, char **argv)
{
piglit_require_GLSL();
piglit_require_extension("GL_ARB_instanced_arrays");
VertShader = piglit_compile_shader_text(GL_VERTEX_SHADER, VertShaderText);
assert(VertShader);
FragShader = piglit_compile_shader_text(GL_FRAGMENT_SHADER, FragShaderText);
assert(FragShader);
Program = piglit_link_simple_program(VertShader, FragShader);
glUseProgram(Program);
PosAttrib = glGetAttribLocation(Program, "Pos");
ColorAttrib = glGetAttribLocation(Program, "Color");
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-5, 5, -5, 5, 10, 20);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -11.0);
glScalef(0.5, 0.5, 1.0);
if ((argc >= 2) && (strcmp(argv[1], "vbo") == 0)) {
use_vbo = GL_TRUE;
}
}
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