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/*
* Copyright (c) 2022, Luke Wilde <lukew@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGL/GL/gl.h>
#include <LibGL/GLContext.h>
#include <LibTest/TestCase.h>
static NonnullOwnPtr<GL::GLContext> create_testing_context()
{
auto bitmap = MUST(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRx8888, { 1, 1 }));
auto context = MUST(GL::create_context(*bitmap));
GL::make_context_current(context);
return context;
}
TEST_CASE(0001_gl_gen_textures_does_not_return_the_same_texture_name_twice_unless_deleted)
{
// https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glGenTextures.xhtml
// "Texture names returned by a call to glGenTextures are not returned by subsequent calls, unless they are first deleted with glDeleteTextures."
auto context = create_testing_context();
GLuint texture1 = 0;
GLuint texture2 = 0;
glGenTextures(1, &texture1);
// glDeleteTextures previously did not check that the texture name was allocated by glGenTextures before adding it to the free texture name list.
// This means that if you delete a texture twice in a row, the name will appear twice in the free texture list, making glGenTextures return the
// same texture name twice in a row.
glDeleteTextures(1, &texture1);
glDeleteTextures(1, &texture1);
texture1 = 0;
glGenTextures(1, &texture1);
glGenTextures(1, &texture2);
EXPECT_NE(texture1, texture2);
}
TEST_CASE(0002_gl_cull_face_does_not_accept_left_and_right)
{
auto context = create_testing_context();
// glCullFace only accepts GL_FRONT, GL_BACK and GL_FRONT_AND_BACK. We checked if the mode was valid by performing cull_mode < GL_FRONT || cull_mode > GL_FRONT_AND_BACK.
// However, this range also contains GL_LEFT and GL_RIGHT, which we would accept when we should return a GL_INVALID_ENUM error.
glCullFace(GL_LEFT);
EXPECT_EQ(glGetError(), static_cast<GLenum>(GL_INVALID_ENUM));
glCullFace(GL_RIGHT);
EXPECT_EQ(glGetError(), static_cast<GLenum>(GL_INVALID_ENUM));
}
TEST_CASE(0003_gl_bind_buffer_names_must_be_allocated)
{
auto context = create_testing_context();
glBindBuffer(GL_ARRAY_BUFFER, 123);
EXPECT_EQ(glGetError(), static_cast<GLenum>(GL_INVALID_VALUE));
}
TEST_CASE(0004_gl_color_clear_value)
{
auto context = create_testing_context();
Array<GLdouble, 4> clear_color;
glGetDoublev(GL_COLOR_CLEAR_VALUE, clear_color.data());
EXPECT_EQ(clear_color[0], 0.);
EXPECT_EQ(clear_color[1], 0.);
EXPECT_EQ(clear_color[2], 0.);
EXPECT_EQ(clear_color[3], 0.);
glClearColor(.1f, .2f, .3f, .4f);
glGetDoublev(GL_COLOR_CLEAR_VALUE, clear_color.data());
EXPECT_APPROXIMATE(clear_color[0], .1);
EXPECT_APPROXIMATE(clear_color[1], .2);
EXPECT_APPROXIMATE(clear_color[2], .3);
EXPECT_APPROXIMATE(clear_color[3], .4);
}
TEST_CASE(0005_gl_depth_clear_value)
{
auto context = create_testing_context();
GLdouble clear_depth;
glGetDoublev(GL_DEPTH_CLEAR_VALUE, &clear_depth);
EXPECT_EQ(clear_depth, 1.);
glClearDepth(.1f);
glGetDoublev(GL_DEPTH_CLEAR_VALUE, &clear_depth);
EXPECT_APPROXIMATE(clear_depth, .1);
}
TEST_CASE(0006_gl_stencil_clear_value)
{
auto context = create_testing_context();
GLint clear_stencil;
glGetIntegerv(GL_STENCIL_CLEAR_VALUE, &clear_stencil);
EXPECT_EQ(clear_stencil, 0);
glClearStencil(255);
glGetIntegerv(GL_STENCIL_CLEAR_VALUE, &clear_stencil);
EXPECT_EQ(clear_stencil, 255);
}
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