void C4FoWDrawWireframeStrategy::End(C4ShaderCall& call)
{
// If we have nothing to draw (e.g. directly after initialization), abort early.
if (vertices.empty()) return;
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
// Upload vertices
glBindBuffer(GL_ARRAY_BUFFER, vbo);
if (vbo_size < vertices.size())
{
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STREAM_DRAW);
vbo_size = vertices.size();
}
else
{
glBufferSubData(GL_ARRAY_BUFFER, 0, vertices.size() * sizeof(Vertex), &vertices[0]);
}
glEnableVertexAttribArray(call.GetAttribute(C4FoWRSA_Position));
glEnableVertexAttribArray(call.GetAttribute(C4FoWRSA_Color));
glVertexAttribPointer(call.GetAttribute(C4FoWRSA_Position), 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const uint8_t*>(offsetof(Vertex, x)));
glVertexAttribPointer(call.GetAttribute(C4FoWRSA_Color), 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const uint8_t*>(offsetof(Vertex, r)));
// Set Y offset for vertex
const float y_offset[] = { 0.0f, 0.0f };
call.SetUniform2fv(C4FoWRSU_VertexOffset, 1, y_offset);
glDrawElements(GL_TRIANGLES, triangulator.GetNIndices(), GL_UNSIGNED_INT, triangulator.GetIndices());
// Reset GL state
glDisableVertexAttribArray(call.GetAttribute(C4FoWRSA_Position));
glDisableVertexAttribArray(call.GetAttribute(C4FoWRSA_Color));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
// Assume the capacity stays the same:
vertices.resize(0);
C4FoWDrawStrategy::End(call);
}
void C4FoWDrawLightTextureStrategy::End(C4ShaderCall& call)
{
// If we have nothing to draw (e.g. directly after initialization), abort early.
if (vertices.empty()) return;
// Upload vertices
glBindBuffer(GL_ARRAY_BUFFER, vbo);
if (vbo_size < vertices.size())
{
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_DYNAMIC_DRAW);
vbo_size = vertices.size();
}
else
{
glBufferSubData(GL_ARRAY_BUFFER, 0, vertices.size() * sizeof(Vertex), &vertices[0]);
}
// Region dimensions
const float width = region->getSurfaceWidth();
const float height = region->getSurfaceHeight() / 2.0;
// Set Y offset for vertex
float y_offset[] = { 0.0f, 0.0f };
call.SetUniform2fv(C4FoWRSU_VertexOffset, 1, y_offset);
// Enable scissor test to only draw in upper or lower half of texture
glEnable(GL_SCISSOR_TEST);
glScissor(0, height, width, height);
// Setup state for 1st pass
glEnableVertexAttribArray(call.GetAttribute(C4FoWRSA_Position));
glEnableVertexAttribArray(call.GetAttribute(C4FoWRSA_Color));
glVertexAttribPointer(call.GetAttribute(C4FoWRSA_Position), 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const uint8_t*>(offsetof(Vertex, x)));
glVertexAttribPointer(call.GetAttribute(C4FoWRSA_Color), 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const uint8_t*>(offsetof(Vertex, r1)));
// Set up blend equation, see C4FoWDrawLightTextureStrategy::DrawVertex
// for details.
glBlendFunc(GL_ONE, GL_ONE);
glBlendEquationSeparate(GL_FUNC_ADD, GL_MAX);
// Render 1st pass
glDrawElements(GL_TRIANGLES, triangulator.GetNIndices(), GL_UNSIGNED_INT, triangulator.GetIndices());
// Prepare state for 2nd pass
glBlendFunc(GL_ONE, GL_ONE);
glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
glVertexAttribPointer(call.GetAttribute(C4FoWRSA_Color), 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const uint8_t*>(offsetof(Vertex, r2)));
// Render 2nd pass
glDrawElements(GL_TRIANGLES, triangulator.GetNIndices(), GL_UNSIGNED_INT, triangulator.GetIndices());
// Prepare state for 3rd pass (color pass)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBlendEquation(GL_FUNC_ADD);
glScissor(0, 0, width, height);
glVertexAttribPointer(call.GetAttribute(C4FoWRSA_Color), 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), reinterpret_cast<const uint8_t*>(offsetof(Vertex, r3)));
y_offset[1] = height;
call.SetUniform2fv(C4FoWRSU_VertexOffset, 1, y_offset);
// Render 3rd pass
glDrawElements(GL_TRIANGLES, triangulator.GetNIndices(), GL_UNSIGNED_INT, triangulator.GetIndices());
// Reset GL state
glDisableVertexAttribArray(call.GetAttribute(C4FoWRSA_Position));
glDisableVertexAttribArray(call.GetAttribute(C4FoWRSA_Color));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDisable(GL_SCISSOR_TEST);
// Assume the capacity stays the same:
vertices.resize(0);
C4FoWDrawStrategy::End(call);
}