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Added SpriteBatch:attachAttribute(attributename, mesh), which lets SpriteBatches use per-vertex information from a vertex attribute in a Mesh when drawing.

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Each sprite in a SpriteBatch has 4 vertices in the following order: top-left, bottom-left, top-right, bottom-right. The index returned by SpriteBatch:add (and used by SpriteBatch:set) can be multiplied by 4 to determine the first vertex in a specific sprite.
This commit is contained in:
Alex Szpakowski
2015-11-26 21:24:29 -04:00
parent f1d0187a58
commit 3c1c13793e
7 changed files with 140 additions and 55 deletions
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src/modules/graphics/opengl/SpriteBatch.cpp
+54 -12
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@@ -193,6 +193,28 @@ int SpriteBatch::getBufferSize() const
return size;
}
void SpriteBatch::attachAttribute(const std::string &name, Mesh *mesh)
{
AttachedAttribute oldattrib = {};
AttachedAttribute newattrib = {};
if (mesh->getVertexCount() < (size_t) getBufferSize() * 4)
throw love::Exception("Mesh has too few vertices to be attached to this SpriteBatch (at least %d vertices are required)", getBufferSize()*4);
auto it = attached_attributes.find(name);
if (it != attached_attributes.end())
oldattrib = it->second;
newattrib.index = mesh->getAttributeIndex(name);
if (newattrib.index < 0)
throw love::Exception("The specified mesh does not have a vertex attribute named '%s'", name.c_str());
newattrib.mesh = mesh;
attached_attributes[name] = newattrib;
}
void SpriteBatch::draw(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky)
{
const size_t pos_offset = offsetof(Vertex, x);
@@ -209,27 +231,47 @@ void SpriteBatch::draw(float x, float y, float angle, float sx, float sy, float
gl.bindTexture(*(GLuint *) texture->getHandle());
GLBuffer::Bind array_bind(*array_buf);
GLBuffer::Bind element_bind(*quad_indices.getBuffer());
// Make sure the VBO isn't mapped when we draw (sends data to GPU if needed.)
array_buf->unmap();
uint32 enabledattribs = ATTRIBFLAG_POS | ATTRIBFLAG_TEXCOORD;
// Apply per-sprite color, if a color is set.
if (color)
{
enabledattribs |= ATTRIBFLAG_COLOR;
glVertexAttribPointer(ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(Vertex), array_buf->getPointer(color_offset));
// Scope this bind so it doesn't interfere with the
// Mesh::bindAttributeToShaderInput calls below.
GLBuffer::Bind array_bind(*array_buf);
// Make sure the VBO isn't mapped when we draw (sends data to GPU if needed.)
array_buf->unmap();
// Apply per-sprite color, if a color is set.
if (color)
{
enabledattribs |= ATTRIBFLAG_COLOR;
glVertexAttribPointer(ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(Vertex), array_buf->getPointer(color_offset));
}
glVertexAttribPointer(ATTRIB_POS, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), array_buf->getPointer(pos_offset));
glVertexAttribPointer(ATTRIB_TEXCOORD, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), array_buf->getPointer(texel_offset));
}
glVertexAttribPointer(ATTRIB_POS, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), array_buf->getPointer(pos_offset));
glVertexAttribPointer(ATTRIB_TEXCOORD, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), array_buf->getPointer(texel_offset));
for (const auto &it : attached_attributes)
{
Mesh *mesh = it.second.mesh.get();
// We have to do this check here as well because setBufferSize can be
// called after attachAttribute.
if (mesh->getVertexCount() < (size_t) getBufferSize() * 4)
throw love::Exception("Mesh with attribute '%s' attached to this SpriteBatch has too few vertices", it.first.c_str());
int location = mesh->bindAttributeToShaderInput(it.second.index, it.first);
if (location >= 0)
enabledattribs |= 1u << (uint32) location;
}
gl.useVertexAttribArrays(enabledattribs);
gl.prepareDraw();
GLBuffer::Bind element_bind(*quad_indices.getBuffer());
gl.drawElements(GL_TRIANGLES, (GLsizei) quad_indices.getIndexCount(next), quad_indices.getType(), quad_indices.getPointer(0));
}