Tests: Add tests for LibGL shader subsystem

Tests/LibGL/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(TEST_SOURCES
     TestAPI.cpp
     TestRender.cpp
+    TestShaders.cpp
 )
 
 foreach(source IN LISTS TEST_SOURCES)

Tests/LibGL/TestShaders.cpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2022, Stephan Unverwerth <s.unverwerth@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/LexicalPath.h>
+#include <AK/String.h>
+#include <LibCore/FileStream.h>
+#include <LibGL/GL/gl.h>
+#include <LibGL/GLContext.h>
+#include <LibGfx/Bitmap.h>
+#include <LibGfx/QOIWriter.h>
+#include <LibTest/TestCase.h>
+
+static NonnullOwnPtr<GL::GLContext> create_testing_context(int width, int height)
+{
+    auto bitmap = MUST(Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRx8888, { width, height }));
+    auto context = MUST(GL::create_context(*bitmap));
+    GL::make_context_current(context);
+
+    return context;
+}
+
+TEST_CASE(0001_program_creation)
+{
+    auto context = create_testing_context(64, 64);
+
+    GLuint vertex_shader;
+    GLuint fragment_shader;
+    GLuint program;
+
+    auto vertex_shader_source = "#version 330\n"
+                                "void main() {\n"
+                                "    gl_Position = vec4(0, 0, 0, 0);\n"
+                                "}\n";
+
+    auto fragment_shader_source = "#version 330\n"
+                                  "out vec4 color;\n"
+                                  "void main() {\n"
+                                  "    color = vec4(1, 1, 1, 1);\n"
+                                  "}\n";
+
+    vertex_shader = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vertex_shader, 1, &vertex_shader_source, nullptr);
+    glCompileShader(vertex_shader);
+
+    fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(fragment_shader, 1, &fragment_shader_source, nullptr);
+    glCompileShader(fragment_shader);
+
+    program = glCreateProgram();
+    glAttachShader(program, vertex_shader);
+    glAttachShader(program, fragment_shader);
+    glLinkProgram(program);
+
+    glDeleteShader(vertex_shader);
+    glDeleteShader(fragment_shader);
+    glDeleteProgram(program);
+
+    EXPECT_EQ(glGetError(), 0u);
+}