void Batch2D::Begin(){
//bind the shader program
shaderProgram.Bind();
//bind the vao, automatically element buffer and attribute info
glBindVertexArray(vao.get());
//bind the vertex array, not automatically done by vao
glBindBuffer(GL_ARRAY_BUFFER, vertexBuff.get());
//enable alpha blending
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//no texture has been assigned
texture = nullptr;
//allow buffer loading
MapBuffers();
//number of instances defaults to 0
instanceCount = 0;
//set 2d projection matrix to screen size
GLint viewportInfo[4];
glGetIntegerv(GL_VIEWPORT, viewportInfo);
glm::mat4 projMat = glm::ortho(0.f, (float)viewportInfo[2], (float)viewportInfo[3], 0.f);
glUniformMatrix4fv(0, 1, GL_FALSE, glm::value_ptr(projMat));
glPointSize(40.0f);
}
void CHUDMesh::Draw()
{
// Grab Render Components //
ID3D11DeviceContext* d3dContext = GRAPHICS->GetDeviceContext();
// Set Shader Resource View //
d3dContext->PSSetShaderResources(0, 1, &m_d3dDiffuse);
if (m_bNormalMapped)
d3dContext->PSSetShaderResources(1, 1, &m_d3dNormals);
// Set Vertex + Index Buffers //
unsigned int nOffset = 0;
unsigned int nStrideSize = sizeof(TVertex2D);
d3dContext->IASetIndexBuffer(m_d3dIndexBuffer, DXGI_FORMAT_R32_UINT, 0);
d3dContext->IASetVertexBuffers(0, 1, &m_d3dVertexBuffer, &nStrideSize, &nOffset);
// Map Constant Buffers //
MapBuffers();
if (m_nInstances)
d3dContext->DrawIndexedInstanced(m_nIndexArr.size(), m_nInstances, 0, 0, 0);
else
d3dContext->DrawIndexed(m_nIndexArr.size(), 0, 0);
}
//draw sprites to framebuffer
void Batch2D::Flush(){
UnmapBuffers();
glDrawElements(GL_TRIANGLES, instanceCount * indexPerSprite, GL_UNSIGNED_SHORT, 0);
instanceCount = 0;
MapBuffers();
}
