XCEngine/tests/RHI/OpenGL/unit/test_vertex_array.cpp

#include "fixtures/OpenGLTestFixture.h"
#include "XCEngine/RHI/OpenGL/OpenGLVertexArray.h"
#include "XCEngine/RHI/OpenGL/OpenGLBuffer.h"

using namespace XCEngine::RHI;

TEST_F(OpenGLTestFixture, VertexArray_Initialize_CreatesVAO) {
    OpenGLVertexArray vao;
    
    bool result = vao.Initialize();
    
    ASSERT_TRUE(result);
    EXPECT_NE(vao.GetID(), 0u);
    
    vao.Shutdown();
}

TEST_F(OpenGLTestFixture, VertexArray_AddVertexBuffer) {
    OpenGLVertexArray vao;
    vao.Initialize();
    
    OpenGLBuffer buffer;
    buffer.InitializeVertexBuffer(nullptr, 64);
    
    VertexAttribute attr;
    attr.index = 0;
    attr.count = 3;
    attr.type = VertexAttributeType::Float;
    attr.normalized = VertexAttributeNormalized::False;
    attr.stride = sizeof(float) * 3;
    attr.offset = 0;
    
    vao.AddVertexBuffer(buffer.GetID(), attr);
    
    EXPECT_EQ(vao.GetID(), 1u);
    
    buffer.Shutdown();
    vao.Shutdown();
}

TEST_F(OpenGLTestFixture, VertexArray_SetIndexBuffer) {
    OpenGLVertexArray vao;
    vao.Initialize();
    
    OpenGLBuffer buffer;
    buffer.InitializeIndexBuffer(nullptr, 12);
    
    vao.SetIndexBuffer(buffer.GetID(), GL_UNSIGNED_INT);
    
    EXPECT_NE(vao.GetIndexBuffer(), 0u);
    
    buffer.Shutdown();
    vao.Shutdown();
}

TEST_F(OpenGLTestFixture, VertexArray_Bind_Unbind) {
    OpenGLVertexArray vao;
    vao.Initialize();
    
    vao.Bind();
    GLint boundVAO = 0;
    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &boundVAO);
    EXPECT_EQ(boundVAO, static_cast<GLint>(vao.GetID()));
    
    vao.Unbind();
    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &boundVAO);
    EXPECT_EQ(boundVAO, 0);
    
    vao.Shutdown();
}

TEST_F(OpenGLTestFixture, VertexArray_Bind_MultipleAttributes) {
    OpenGLVertexArray vao;
    vao.Initialize();
    
    OpenGLBuffer buffer1;
    float positions[] = { 0.0f, 0.0f, 0.5f, 0.5f };
    buffer1.InitializeVertexBuffer(positions, sizeof(positions));
    
    OpenGLBuffer buffer2;
    float colors[] = { 1.0f, 0.0f, 0.0f, 1.0f };
    buffer2.InitializeVertexBuffer(colors, sizeof(colors));
    
    VertexAttribute attrPos;
    attrPos.index = 0;
    attrPos.count = 2;
    attrPos.type = VertexAttributeType::Float;
    attrPos.normalized = VertexAttributeNormalized::False;
    attrPos.stride = sizeof(float) * 2;
    attrPos.offset = 0;
    
    VertexAttribute attrColor;
    attrColor.index = 1;
    attrColor.count = 4;
    attrColor.type = VertexAttributeType::Float;
    attrColor.normalized = VertexAttributeNormalized::False;
    attrColor.stride = sizeof(float) * 4;
    attrColor.offset = 0;
    
    vao.AddVertexBuffer(buffer1.GetID(), attrPos);
    vao.AddVertexBuffer(buffer2.GetID(), attrColor);
    
    vao.Bind();
    GLint boundVAO = 0;
    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &boundVAO);
    EXPECT_EQ(boundVAO, static_cast<GLint>(vao.GetID()));
    
    vao.Unbind();
    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &boundVAO);
    EXPECT_EQ(boundVAO, 0);
    
    buffer1.Shutdown();
    buffer2.Shutdown();
    vao.Shutdown();
}