From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 13 Nov 2014 21:43:05 +0000 (+0200)
Subject: Add a new transform API to Renderer.
X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=commitdiff_plain;h=6db6b7e49848e6bbc14f3ec8113ee5a941e4af07

Add a new transform API to Renderer.

Accessing the matrix stack directly is unsafe as it allows the caller to
push and pop on it independently of Renderer states.
---

diff --git a/demos/cubemap.cpp b/demos/cubemap.cpp
index 4679590d..2a0bc02c 100644
--- a/demos/cubemap.cpp
+++ b/demos/cubemap.cpp
@@ -116,19 +116,19 @@ int main()
 			renderer.set_material(&material);
 			renderer.set_shader_program(&shprog, &shdata);
 			renderer.set_texture(&texture);
-			renderer.matrix_stack() *= GL::Matrix::translation(0, 0, -7);
+			renderer.transform(GL::Matrix::translation(0, 0, -7));
 			{
 				GL::Renderer::Push _push(renderer);
-				renderer.matrix_stack() *= GL::Matrix::translation(-2, 0, 0);
-				renderer.matrix_stack() *= GL::Matrix::rotation(angle/2.3, 0, 1, 0);
-				renderer.matrix_stack() *= GL::Matrix::rotation(angle, 1, 0.25, 0);
+				renderer.transform(GL::Matrix::translation(-2, 0, 0));
+				renderer.transform(GL::Matrix::rotation(angle/2.3, 0, 1, 0));
+				renderer.transform(GL::Matrix::rotation(angle, 1, 0.25, 0));
 				box.draw(renderer);
 			}
 			{
 				GL::Renderer::Push _push(renderer);
-				renderer.matrix_stack() *= GL::Matrix::translation(2, 0, 0);
-				renderer.matrix_stack() *= GL::Matrix::rotation(-angle/2.3, 0, 1, 0);
-				renderer.matrix_stack() *= GL::Matrix::rotation(angle, 1, 0.25, 0);
+				renderer.transform(GL::Matrix::translation(2, 0, 0));
+				renderer.transform(GL::Matrix::rotation(-angle/2.3, 0, 1, 0));
+				renderer.transform(GL::Matrix::rotation(angle, 1, 0.25, 0));
 				cylinder.draw(renderer);
 			}
 		}
diff --git a/demos/shaders.cpp b/demos/shaders.cpp
index 5a268fec..6b7336fe 100644
--- a/demos/shaders.cpp
+++ b/demos/shaders.cpp
@@ -109,10 +109,10 @@ int main()
 			renderer.add_shader_data(progdata);
 			for(unsigned i=0; i<12; ++i)
 			{
-				GL::MatrixStack::Push push(renderer.matrix_stack());
+				GL::Renderer::Push push(renderer);
 				renderer.set_shader_program(programs[i]);
-				renderer.matrix_stack() *= GL::Matrix::translation(-3.3+(i%4)*2.2, 0, -3.5+(i/4)*3.0);
-				renderer.matrix_stack() *= GL::Matrix::rotation(angle, 0, 0, 1);
+				renderer.transform(GL::Matrix::translation(-3.3+(i%4)*2.2, 0, -3.5+(i/4)*3.0));
+				renderer.transform(GL::Matrix::rotation(angle, 0, 0, 1));
 				mesh.draw(renderer);
 			}
 		}
diff --git a/source/animatedobject.cpp b/source/animatedobject.cpp
index 4be198a8..3a1d9d83 100644
--- a/source/animatedobject.cpp
+++ b/source/animatedobject.cpp
@@ -43,7 +43,7 @@ void AnimatedObject::set_pose_matrix(unsigned link, const Matrix &m)
 
 void AnimatedObject::setup_render(Renderer &renderer, const Tag &) const
 {
-	renderer.matrix_stack() *= matrix;
+	renderer.transform(matrix);
 	if(shdata)
 		renderer.add_shader_data(*shdata);
 }
diff --git a/source/renderer.cpp b/source/renderer.cpp
index 184d3269..c558757f 100644
--- a/source/renderer.cpp
+++ b/source/renderer.cpp
@@ -61,6 +61,16 @@ void Renderer::begin(const Camera *c)
 	}
 }
 
+void Renderer::set_matrix(const Matrix &matrix)
+{
+	mtx_stack.load(matrix);
+}
+
+void Renderer::transform(const Matrix &matrix)
+{
+	mtx_stack *= matrix;
+}
+
 void Renderer::set_texture(const Texture *t)
 {
 	state->texture = t;
diff --git a/source/renderer.h b/source/renderer.h
index 10d1fb3f..18d3a41a 100644
--- a/source/renderer.h
+++ b/source/renderer.h
@@ -118,8 +118,18 @@ public:
 	times without an intervening end(). */
 	void begin(const Camera *);
 
+	/** Deprecated as unsafe.  Use set_matrix() or transform() instead. */
 	MatrixStack &matrix_stack() { return mtx_stack; }
 
+	/** Replaces the Renderer's modelview matrix. */
+	void set_matrix(const Matrix &);
+
+	/** Applies a transform to the Renderer's modelview matrix. */
+	void transform(const Matrix &);
+
+	/** Returns the current modelview matrix. */
+	const Matrix &get_matrix() const { return mtx_stack.top(); }
+
 	const Camera *get_camera() const { return camera; }
 
 	void set_texture(const Texture *);