LibGL: Add some tests for the buffer API

Tests/LibGL/TestAPI.cpp

@@ -53,3 +53,11 @@ TEST_CASE(0002_gl_cull_face_does_not_accept_left_and_right)
     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));
+}

Tests/LibGL/TestRender.cpp

@@ -269,3 +269,33 @@ TEST_CASE(0009_test_draw_elements_in_display_list)
     context->present();
     expect_bitmap_equals_reference(context->frontbuffer(), "0009_test_draw_elements_in_display_list"sv);
 }
+
+TEST_CASE(0010_test_store_data_in_buffer)
+{
+    auto context = create_testing_context(64, 64);
+
+    glColor3f(1.f, 0.f, 0.f);
+    glEnableClientState(GL_VERTEX_ARRAY);
+
+    float vertices[] = { 0.f, .5f, -.5f, -.5f, .5f, -.5f };
+    u8 indices[] = { 0, 1, 2 };
+
+    GLuint buffers[2];
+    glGenBuffers(2, buffers);
+
+    glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
+    glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(float), vertices, GL_STATIC_DRAW);
+
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, 3, indices, GL_STATIC_DRAW);
+
+    glVertexPointer(2, GL_FLOAT, 0, 0);
+    glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_BYTE, 0);
+
+    glDeleteBuffers(2, buffers);
+
+    EXPECT_EQ(glGetError(), 0u);
+
+    context->present();
+    expect_bitmap_equals_reference(context->frontbuffer(), "0010_test_store_data_in_buffer"sv);
+}