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#include "drape/mesh_object.hpp"
#include "drape/glconstants.hpp"
#include "drape/glextensions_list.hpp"
#include "drape/glfunctions.hpp"
#include "drape/glsl_func.hpp"
#include "drape/glsl_types.hpp"
#include "drape/gpu_program.hpp"
#include "drape/texture_manager.hpp"
namespace
{
glConst GetGLDrawPrimitive(dp::MeshObject::DrawPrimitive drawPrimitive)
{
switch (drawPrimitive)
{
case dp::MeshObject::DrawPrimitive::Triangles: return gl_const::GLTriangles;
case dp::MeshObject::DrawPrimitive::TriangleStrip: return gl_const::GLTriangleStrip;
case dp::MeshObject::DrawPrimitive::LineStrip: return gl_const::GLLineStrip;
}
}
} // namespace
namespace dp
{
MeshObject::MeshObject(DrawPrimitive drawPrimitive)
: m_drawPrimitive(drawPrimitive)
{}
MeshObject::~MeshObject()
{
Reset();
}
void MeshObject::SetBuffer(uint32_t bufferInd, std::vector<float> && vertices, uint32_t stride)
{
CHECK_LESS_OR_EQUAL(bufferInd, GetNextBufferIndex(), ());
if (bufferInd == GetNextBufferIndex())
m_buffers.emplace_back(std::move(vertices), stride);
else
m_buffers[bufferInd] = VertexBuffer(std::move(vertices), stride);
Reset();
}
void MeshObject::SetAttribute(std::string const & attributeName, uint32_t bufferInd, uint32_t offset,
uint32_t componentsCount)
{
CHECK_LESS(bufferInd, m_buffers.size(), ());
m_buffers[bufferInd].m_attributes.emplace_back(attributeName, offset, componentsCount);
Reset();
}
void MeshObject::Reset()
{
for (auto & buffer : m_buffers)
{
if (buffer.m_bufferId != 0)
{
GLFunctions::glDeleteBuffer(buffer.m_bufferId);
buffer.m_bufferId = 0;
}
}
if (m_VAO != 0)
GLFunctions::glDeleteVertexArray(m_VAO);
m_VAO = 0;
m_initialized = false;
}
void MeshObject::UpdateBuffer(uint32_t bufferInd, std::vector<float> && vertices)
{
CHECK(m_initialized, ());
CHECK_LESS(bufferInd, static_cast<uint32_t>(m_buffers.size()), ());
CHECK(m_buffers[bufferInd].m_bufferId != 0, ());
CHECK(!vertices.empty(), ());
auto & buffer = m_buffers[bufferInd];
buffer.m_data = std::move(vertices);
GLFunctions::glBindBuffer(buffer.m_bufferId, gl_const::GLArrayBuffer);
GLFunctions::glBufferData(gl_const::GLArrayBuffer,
static_cast<uint32_t>(buffer.m_data.size()) * sizeof(buffer.m_data[0]),
buffer.m_data.data(), gl_const::GLStaticDraw);
GLFunctions::glBindBuffer(0, gl_const::GLArrayBuffer);
}
void MeshObject::Build(ref_ptr<dp::GpuProgram> program)
{
Reset();
bool const isVAOSupported = dp::GLExtensionsList::Instance().IsSupported(dp::GLExtensionsList::VertexArrayObject);
if (isVAOSupported)
{
m_VAO = GLFunctions::glGenVertexArray();
GLFunctions::glBindVertexArray(m_VAO);
}
for (auto & buffer : m_buffers)
{
buffer.m_bufferId = GLFunctions::glGenBuffer();
GLFunctions::glBindBuffer(buffer.m_bufferId, gl_const::GLArrayBuffer);
if (!buffer.m_data.empty())
{
GLFunctions::glBufferData(gl_const::GLArrayBuffer,
static_cast<uint32_t>(buffer.m_data.size()) * sizeof(buffer.m_data[0]),
buffer.m_data.data(), gl_const::GLStaticDraw);
}
if (isVAOSupported)
{
for (auto const & attribute : buffer.m_attributes)
{
int8_t const attributePosition = program->GetAttributeLocation(attribute.m_attributeName);
ASSERT_NOT_EQUAL(attributePosition, -1, ());
GLFunctions::glEnableVertexAttribute(attributePosition);
GLFunctions::glVertexAttributePointer(attributePosition, attribute.m_componentsCount,
gl_const::GLFloatType, false,
buffer.m_stride, attribute.m_offset);
}
}
}
if (isVAOSupported)
GLFunctions::glBindVertexArray(0);
GLFunctions::glBindBuffer(0, gl_const::GLArrayBuffer);
m_initialized = true;
}
void MeshObject::Bind(ref_ptr<dp::GpuProgram> program)
{
program->Bind();
if (!m_initialized)
Build(program);
if (dp::GLExtensionsList::Instance().IsSupported(dp::GLExtensionsList::VertexArrayObject))
{
GLFunctions::glBindVertexArray(m_VAO);
}
else
{
for (auto const & buffer : m_buffers)
{
GLFunctions::glBindBuffer(buffer.m_bufferId, gl_const::GLArrayBuffer);
for (auto const & attribute : buffer.m_attributes)
{
int8_t const attributePosition = program->GetAttributeLocation(attribute.m_attributeName);
ASSERT_NOT_EQUAL(attributePosition, -1, ());
GLFunctions::glEnableVertexAttribute(attributePosition);
GLFunctions::glVertexAttributePointer(attributePosition, attribute.m_componentsCount,
gl_const::GLFloatType, false,
buffer.m_stride, attribute.m_offset);
}
}
}
}
void MeshObject::DrawPrimitives()
{
if (m_buffers.empty())
return;
auto const & buffer = m_buffers[0];
auto const verticesCount = static_cast<uint32_t>(buffer.m_data.size() * sizeof(buffer.m_data[0]) / buffer.m_stride);
GLFunctions::glDrawArrays(GetGLDrawPrimitive(m_drawPrimitive), 0, verticesCount);
}
void MeshObject::Unbind(ref_ptr<dp::GpuProgram> program)
{
program->Unbind();
if (dp::GLExtensionsList::Instance().IsSupported(dp::GLExtensionsList::VertexArrayObject))
GLFunctions::glBindVertexArray(0);
GLFunctions::glBindBuffer(0, gl_const::GLArrayBuffer);
}
// static
std::vector<float> MeshObject::GenerateNormalsForTriangles(std::vector<float> const & vertices,
size_t componentsCount)
{
auto const trianglesCount = vertices.size() / (3 * componentsCount);
std::vector<float> normals;
normals.reserve(trianglesCount * 9);
for (size_t triangle = 0; triangle < trianglesCount; ++triangle)
{
glsl::vec3 v[3];
for (size_t vertex = 0; vertex < 3; ++vertex)
{
size_t const offset = triangle * componentsCount * 3 + vertex * componentsCount;
v[vertex] = glsl::vec3(vertices[offset], vertices[offset + 1], vertices[offset + 2]);
}
glsl::vec3 normal = glsl::cross(glsl::vec3(v[1].x - v[0].x, v[1].y - v[0].y, v[1].z - v[0].z),
glsl::vec3(v[2].x - v[0].x, v[2].y - v[0].y, v[2].z - v[0].z));
normal = glsl::normalize(normal);
for (size_t vertex = 0; vertex < 3; ++vertex)
{
normals.push_back(normal.x);
normals.push_back(normal.y);
normals.push_back(normal.z);
}
}
return normals;
}
} // namespace dp
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