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 C4ParticleChunk::Draw(C4TargetFacet cgo, C4Object *obj, C4ShaderCall& call, int texUnit, const StdProjectionMatrix& modelview)
{
if (particleCount == 0) return;
const int stride = sizeof(C4Particle::DrawingData::Vertex);
assert(sourceDefinition && "No source definition assigned to particle chunk.");
C4TexRef *textureRef = &sourceDefinition->Gfx.GetFace().textures[0];
assert(textureRef != 0 && "Particle definition had no texture assigned.");
// use a relative offset?
// (note the normal matrix is unaffected by this)
if ((attachment & C4ATTACH_MoveRelative) && (obj != 0))
{
StdProjectionMatrix new_modelview(modelview);
Translate(new_modelview, fixtof(obj->GetFixedX()), fixtof(obj->GetFixedY()), 0.0f);
call.SetUniformMatrix4x4(C4SSU_ModelViewMatrix, new_modelview);
}
else
{
call.SetUniformMatrix4x4(C4SSU_ModelViewMatrix, modelview);
}
// enable additive blending for particles with that blit mode
glBlendFunc(GL_SRC_ALPHA, (blitMode & C4GFXBLIT_ADDITIVE) ? GL_ONE : GL_ONE_MINUS_SRC_ALPHA);
glActiveTexture(texUnit);
glBindTexture(GL_TEXTURE_2D, textureRef->texName);
// generate the buffer as necessary
if (drawingDataVertexBufferObject == 0)
{
// clear up old data
ClearBufferObjects();
// generate new buffer objects
glGenBuffers(1, &drawingDataVertexBufferObject);
assert (drawingDataVertexBufferObject != 0 && "Could not generate OpenGL buffer object.");
// Immediately bind the buffer.
// glVertexAttribPointer requires a valid GL_ARRAY_BUFFER to be bound and we need the buffer to be created for glObjectLabel.
glBindBuffer(GL_ARRAY_BUFFER, drawingDataVertexBufferObject);
#ifdef GL_KHR_debug
if (glObjectLabel)
glObjectLabel(GL_BUFFER, drawingDataVertexBufferObject, -1, "<particles>/VBO");
#endif
// generate new VAO ID
drawingDataVertexArraysObject = pGL->GenVAOID();
assert (drawingDataVertexArraysObject != 0 && "Could not generate a VAO ID.");
}
// Push the new vertex data
glBindBuffer(GL_ARRAY_BUFFER, drawingDataVertexBufferObject);
glBufferData(GL_ARRAY_BUFFER, 4 * sizeof(C4Particle::DrawingData::Vertex) * particleCount, &vertexCoordinates[0], GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// set up the vertex array structure
GLuint vao;
const bool has_vao = pGL->GetVAO(drawingDataVertexArraysObject, vao);
glBindVertexArray(vao);
assert ((drawingDataVertexBufferObject != 0) && "No buffer object has been created yet.");
assert ((drawingDataVertexArraysObject != 0) && "No vertex arrays object has been created yet.");
if (!has_vao)
{
glBindBuffer(GL_ARRAY_BUFFER, drawingDataVertexBufferObject);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ::Particles.GetIBO());
#ifdef GL_KHR_debug
if (glObjectLabel)
glObjectLabel(GL_VERTEX_ARRAY, vao, -1, "<particles>/VAO");
#endif
glEnableVertexAttribArray(call.GetAttribute(C4SSA_Position));
glEnableVertexAttribArray(call.GetAttribute(C4SSA_Color));
glEnableVertexAttribArray(call.GetAttribute(C4SSA_TexCoord));
glVertexAttribPointer(call.GetAttribute(C4SSA_Position), 2, GL_FLOAT, GL_FALSE, stride, reinterpret_cast<GLvoid*>(offsetof(C4Particle::DrawingData::Vertex, x)));
glVertexAttribPointer(call.GetAttribute(C4SSA_TexCoord), 2, GL_FLOAT, GL_FALSE, stride, reinterpret_cast<GLvoid*>(offsetof(C4Particle::DrawingData::Vertex, u)));
glVertexAttribPointer(call.GetAttribute(C4SSA_Color), 4, GL_FLOAT, GL_FALSE, stride, reinterpret_cast<GLvoid*>(offsetof(C4Particle::DrawingData::Vertex, r)));
}
glDrawElements(GL_TRIANGLE_STRIP, static_cast<GLsizei> (5 * particleCount), GL_UNSIGNED_INT, 0);
// reset buffer data
glBindVertexArray(0);
}
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);
}