render: Use separate model, view, and projection matrices.

* sly/render.scm: Replace 'model-view' procedures with separate 'model'
and 'view' procedures.
(<graphics>)[model-view]: Delete field.
[model, view]: New fields.
* sly/render/camera.scm (with-camera): Use separate model/view matrices.
* sly/render/shader.scm (%default-shader): Specify model, view, and
projection uniforms.
* sly/render/sprite-batch.scm (sprite-batch-flush!): Use new model,
view, and projection uniforms.
* data/shaders/default-vertex.glsl (model, view, projection): New
uniforms.
(mvp): Delete.

1 files changed, 4 insertions, 2 deletions

diff --git a/data/shaders/default-vertex.glsl b/data/shaders/default-vertex.glsl
index 11f389f..d2ab135 100644
--- a/data/shaders/default-vertex.glsl
+++ b/data/shaders/default-vertex.glsl
@@ -3,9 +3,11 @@
 in vec3 position;
 in vec2 tex;
 out vec2 frag_tex;
-uniform mat4 mvp;
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
 
 void main(void) {
     frag_tex = tex;
-    gl_Position = mvp * vec4(position.xyz, 1.0);
+    gl_Position = projection * view * model * vec4(position.xyz, 1.0);
 }