1 files changed, 44 insertions, 0 deletions

diff --git a/src/renderer/imm_renderer_impl.h b/src/renderer/imm_renderer_impl.h
new file mode 100644
index 0000000..5ece354
--- /dev/null
+++ b/src/renderer/imm_renderer_impl.h
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <gfx/renderer.h>
+#include <gfx/sizes.h>
+
+#include <math/mat4.h>
+#include <math/vec3.h>
+
+#include <stdbool.h>
+#include <stddef.h>
+
+typedef struct Geometry      Geometry;
+typedef struct ShaderProgram ShaderProgram;
+
+/// Immediate mode renderer.
+///
+/// Currently, the immediate mode renderer can only draw up to a maximum number
+/// of primitives per frame. It does not adjust this number dynamically. Keeps
+/// things simple while the extra complexity is not needed.
+typedef struct ImmRenderer {
+  GfxCore*       gfxcore;
+  ShaderProgram* shader;
+  Geometry*      triangles;
+  size_t         num_triangle_verts; // Number of triangle verts this frame.
+  // TODO: wireframe rendering.
+  struct {
+    bool wireframe : 1;
+  } flags;
+  vec3 triangle_verts[IMM_MAX_NUM_TRIANGLES * 3];
+  // Matrix stack contains pre-multiplied matrices.
+  // It is also never empty. The top of the stack is an identity matrix when the
+  // stack is "empty" from the user's perspective.
+  mat4 matrix_stack[IMM_MAX_NUM_MATRICES];
+  int  stack_pointer;
+} ImmRenderer;
+
+/// Create a new immediate mode renderer.
+bool imm_renderer_make(ImmRenderer*, GfxCore*);
+
+/// Destroy the immediate mode renderer.
+void imm_renderer_destroy(ImmRenderer*);
+
+/// Flush draw commands.
+void imm_renderer_flush(ImmRenderer*);