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// Copyright (c) 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 <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <stdint.h>
#include "gpu/command_buffer/tests/gl_manager.h"
#include "gpu/command_buffer/tests/gl_test_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace gpu {
// A collection of tests that exercise the GL_EXT_srgb extension.
class GLBGRAMipMapTest : public testing::Test {
protected:
void SetUp() override { gl_.Initialize(GLManager::Options()); }
void TearDown() override { gl_.Destroy(); }
GLManager gl_;
};
// Test to ensure that using GL_BGRA as a texture internal format does
// not hinder the use of mipmaps. Support for GL_BGRA as an internal format
// is required by ES 2.0 (internal format must be equal to external format),
// but some desktop GL implementations may not fully support the use of
// GL_BGRA. For example, Mesa+Intel does not support mipmapping on textures
// that use the GL_BGRA internal format. This test verifies a workaround.
TEST_F(GLBGRAMipMapTest, GenerateMipmapsSucceeds) {
static const int kWidth = 100;
static const int kHeight = 50;
uint8_t pixels[kWidth * kHeight * 4];
GLuint tex = 0;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
memset(pixels, 128, sizeof(pixels));
glTexImage2D(GL_TEXTURE_2D, 0, GL_BGRA_EXT, kWidth, kHeight, 0,
GL_BGRA_EXT, GL_UNSIGNED_BYTE, pixels);
EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
// Without the workaround, the following call generates a
// GL_INVALID_OPERATION error on some desktop GL implementations
glGenerateMipmap(GL_TEXTURE_2D);
EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
}
} // namespace gpu
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