chrisbell/rmlui-raylib-backend
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Added 'transform' support

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chris bell
2026-08-30 18:45:07 -05:00
parent 531ad69bcc
commit b75eebfd49
5 changed files with 25 additions and 3 deletions
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2
assets/main.rml
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@@ -5,5 +5,7 @@
</head> </head>
<body> <body>
<h1>Hello from RmlUi</h1> <h1>Hello from RmlUi</h1>
<div style="position:absolute; top: 0; left: 0; width: 200px; height: 100px; background-color: rgba(255, 0, 0, 128); transform: rotate(15deg) translate(50px,0) scale(0.8)">
</div>
</body> </body>
</rml> </rml>

2
readme.md
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@@ -8,7 +8,7 @@ I originally began creating this for a Game Jam project where I got the basic re
*Rendering features (from the RmlUi render interfface documentation https://mikke89.github.io/RmlUiDoc/pages/cpp_manual/interfaces/render.html#feature-table):* *Rendering features (from the RmlUi render interfface documentation https://mikke89.github.io/RmlUiDoc/pages/cpp_manual/interfaces/render.html#feature-table):*
- [x] Basic rendering - [x] Basic rendering
- [ ] Clip Mask - [ ] Clip Mask
- [ ] Transforms - [x] Transforms
- [ ] Layers - [ ] Layers
- [ ] Render textures - [ ] Render textures
- [ ] Mask images - [ ] Mask images

13
src/backend/RaylibRenderInterface.cpp
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@@ -39,6 +39,10 @@ void RaylibRenderInterface::RenderGeometry(Rml::CompiledGeometryHandle handle,
rlPushMatrix(); rlPushMatrix();
rlTranslatef(translation.x, translation.y, 0.0f); rlTranslatef(translation.x, translation.y, 0.0f);
if (has_transform) {
rlMultMatrixf(current_transform.data());
}
rlBegin(RL_TRIANGLES); rlBegin(RL_TRIANGLES);
for (size_t i = 0; i + 2 < geo->indices.size(); i += 3) { for (size_t i = 0; i + 2 < geo->indices.size(); i += 3) {
for (int j = 0; j < 3; ++j) { for (int j = 0; j < 3; ++j) {
@@ -114,3 +118,12 @@ void RaylibRenderInterface::ApplyScissor() {
BeginScissorMode(scissor_region.Left(), scissor_region.Top(), BeginScissorMode(scissor_region.Left(), scissor_region.Top(),
scissor_region.Width(), scissor_region.Height()); scissor_region.Width(), scissor_region.Height());
} }
void RaylibRenderInterface::SetTransform(const Rml::Matrix4f *transform) {
if (transform) {
has_transform = true;
current_transform = *transform;
} else {
has_transform = false;
}
}

5
src/backend/RaylibRenderInterface.h
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@@ -30,9 +30,14 @@ public:
void EnableScissorRegion(bool enable) override; void EnableScissorRegion(bool enable) override;
void SetScissorRegion(Rml::Rectanglei region) override; void SetScissorRegion(Rml::Rectanglei region) override;
void SetTransform(const Rml::Matrix4f *transform) override;
private: private:
void ApplyScissor(); void ApplyScissor();
bool scissor_enabled = false; bool scissor_enabled = false;
Rml::Rectanglei scissor_region; Rml::Rectanglei scissor_region;
bool has_transform = false;
Rml::Matrix4f current_transform;
}; };

2
src/main.cpp
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@@ -50,6 +50,8 @@ int main() {
} }
CloseWindow(); CloseWindow();
Rml::Debugger::Shutdown();
Rml::Shutdown();
return 0; return 0;
} }