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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gl/test/gl_test_helper.h"
#include <string>
#include "base/memory/scoped_ptr.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace gl {
// static
GLuint GLTestHelper::CreateTexture(GLenum target) {
// Create the texture object.
GLuint texture = 0;
glGenTextures(1, &texture);
glBindTexture(target, texture);
glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
return texture;
}
// static
GLuint GLTestHelper::SetupFramebuffer(int width, int height) {
GLuint color_buffer_texture = CreateTexture(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, color_buffer_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
GL_UNSIGNED_BYTE, nullptr);
GLuint framebuffer = 0;
glGenFramebuffersEXT(1, &framebuffer);
glBindFramebufferEXT(GL_FRAMEBUFFER, framebuffer);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
color_buffer_texture, 0);
if (glCheckFramebufferStatusEXT(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
glCheckFramebufferStatusEXT(GL_FRAMEBUFFER))
<< "Error setting up framebuffer";
glDeleteFramebuffersEXT(1, &framebuffer);
framebuffer = 0;
}
glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
glDeleteTextures(1, &color_buffer_texture);
return framebuffer;
}
// static
bool GLTestHelper::CheckPixels(int x,
int y,
int width,
int height,
const uint8_t expected_color[4]) {
int size = width * height * 4;
scoped_ptr<uint8_t[]> pixels(new uint8_t[size]);
const uint8_t kCheckClearValue = 123u;
memset(pixels.get(), kCheckClearValue, size);
glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels.get());
int bad_count = 0;
for (int yy = 0; yy < height; ++yy) {
for (int xx = 0; xx < width; ++xx) {
int offset = yy * width * 4 + xx * 4;
for (int jj = 0; jj < 4; ++jj) {
uint8_t actual = pixels[offset + jj];
uint8_t expected = expected_color[jj];
EXPECT_EQ(expected, actual) << " at " << (xx + x) << ", " << (yy + y)
<< " channel " << jj;
bad_count += actual != expected;
// Exit early just so we don't spam the log but we print enough to
// hopefully make it easy to diagnose the issue.
if (bad_count > 16)
return false;
}
}
}
return !bad_count;
}
} // namespace gl
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