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/*
* Copyright © 2009 Intel Corporation
* Copyright (c) 2010 VMware, Inc.
* Copyright © 2011 Red Hat 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
* 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.
*
* Authors:
* Dave Airlie
*
*/
/** @file fbo-array.c
*
* Tests that drawing to each level of an array texture FBO and then drawing views * of those individual depths to the window system framebuffer succeeds.
* based on fbo-3d.c and array-texture.c
*/
#include "piglit-util.h"
#define BUF_WIDTH 32
#define BUF_HEIGHT 32
PIGLIT_GL_TEST_MAIN(
200 /*window_width*/,
100 /*window_height*/,
GLUT_DOUBLE | GLUT_RGB)
#define NUM_LAYERS 6
float layer_color[NUM_LAYERS][4] = {
{1.0, 0.0, 0.0, 0.0},
{0.0, 1.0, 0.0, 0.0},
{0.0, 0.0, 1.0, 0.0},
{1.0, 0.0, 1.0, 0.0},
{1.0, 1.0, 0.0, 0.0},
{0.0, 1.0, 1.0, 0.0},
};
int num_layers = NUM_LAYERS;
static const char *prog = "fbo-array";
/* debug aid */
static void
check_error(int line)
{
GLenum err = glGetError();
if (err) {
printf("%s: GL error 0x%x at line %d\n", prog, err, line);
}
}
static const char *frag_shader_2d_array_text =
"#extension GL_EXT_texture_array : enable \n"
"uniform sampler2DArray tex; \n"
"void main() \n"
"{ \n"
" gl_FragColor = texture2DArray(tex, gl_TexCoord[0].xyz); \n"
"} \n";
static GLuint frag_shader_2d_array;
static GLuint program_2d_array;
static int
create_array_fbo(void)
{
GLuint tex, fb;
GLenum status;
int layer;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D_ARRAY_EXT, tex);
assert(glGetError() == 0);
/* allocate empty array texture */
glTexImage3D(GL_TEXTURE_2D_ARRAY_EXT, 0, GL_RGBA,
BUF_WIDTH, BUF_HEIGHT, num_layers,
0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
assert(glGetError() == 0);
glGenFramebuffersEXT(1, &fb);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
/* draw something into each layer of the array texture */
for (layer = 0; layer < NUM_LAYERS; layer++) {
glFramebufferTextureLayer(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
tex,
0,
layer);
assert(glGetError() == 0);
status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
fprintf(stderr, "FBO incomplete\n");
goto done;
}
glViewport(0, 0, BUF_WIDTH, BUF_HEIGHT);
piglit_ortho_projection(BUF_WIDTH, BUF_HEIGHT, GL_FALSE);
/* solid color quad */
glColor4fv(layer_color[layer]);
piglit_draw_rect(-2, -2, BUF_WIDTH + 2, BUF_HEIGHT + 2);
}
done:
glDeleteFramebuffersEXT(1, &fb);
return tex;
}
/* Draw a textured quad, sampling only the given layer of the
* array texture.
*/
static void
draw_layer(int x, int y, int depth)
{
GLfloat depth_coord = (GLfloat)depth;
GLint loc;
glUseProgram(program_2d_array);
loc = glGetUniformLocation(program_2d_array, "tex");
glUniform1i(loc, 0); /* texture unit p */
glViewport(0, 0, piglit_width, piglit_height);
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glBegin(GL_QUADS);
glTexCoord3f(0, 0, depth_coord);
glVertex2f(x, y);
glTexCoord3f(1, 0, depth_coord);
glVertex2f(x + BUF_WIDTH, y);
glTexCoord3f(1, 1, depth_coord);
glVertex2f(x + BUF_WIDTH, y + BUF_HEIGHT);
glTexCoord3f(0, 1, depth_coord);
glVertex2f(x, y + BUF_HEIGHT);
glEnd();
glUseProgram(0);
}
static GLboolean test_layer_drawing(int start_x, int start_y, float *expected)
{
return piglit_probe_rect_rgb(start_x, start_y, BUF_WIDTH, BUF_HEIGHT,
expected);
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int layer;
GLuint tex;
glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
tex = create_array_fbo();
for (layer = 0; layer < NUM_LAYERS; layer++) {
int x = 1 + layer * (BUF_WIDTH + 1);
int y = 1;
draw_layer(x, y, layer);
}
for (layer = 0; layer < NUM_LAYERS; layer++) {
int x = 1 + layer * (BUF_WIDTH + 1);
int y = 1;
pass &= test_layer_drawing(x, y, layer_color[layer]);
}
glDeleteTextures(1, &tex);
glutSwapBuffers();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void piglit_init(int argc, char **argv)
{
piglit_require_extension("GL_EXT_framebuffer_object");
piglit_require_extension("GL_EXT_texture_array");
/* Make shader programs */
frag_shader_2d_array =
piglit_compile_shader_text(GL_FRAGMENT_SHADER,
frag_shader_2d_array_text);
check_error(__LINE__);
program_2d_array = piglit_link_simple_program(0, frag_shader_2d_array);
check_error(__LINE__);
}
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