Implement basic perf counters

2 files changed, 34 insertions, 0 deletions

diff --git a/include/swgfx.h b/include/swgfx.h
index 9c3361d..72164b1 100644
--- a/include/swgfx.h
+++ b/include/swgfx.h
@@ -22,6 +22,8 @@ Multi-threading:
 #include <stddef.h>
 #include <stdint.h>
 
+#define SWGFX_PROFILING 1 // TODO: Move this to client project cmake.
+
 typedef float R;
 
 typedef struct sgVec2i { int x, y; }       sgVec2i;
@@ -66,6 +68,15 @@ typedef struct sgImage {
 
 typedef struct swgfx swgfx;
 
+#if SWGFX_PROFILING
+typedef struct sgCounters {
+  uint64_t frames;     // Frames drawn.
+  uint64_t triangles3; // 3D triangles processed.
+  uint64_t triangles2; // 2D triangles processed.
+  uint64_t pixels;     // Pixels written.
+} sgCounters;
+#endif // SWGFX_PROFILING
+
 size_t sgMem(int width, int height); // Get memory requirements.
 swgfx* sgNew(int width, int height, void* mem);
 void   sgDel(swgfx**);
@@ -98,4 +109,6 @@ void sgTrianglesIndexedNonUniform(swgfx*, size_t numTris, const sgTriIdx* tris,
 void sgGamma   (swgfx*, sgPixel*, int width, int height);
 void sgGammaInv(swgfx*, sgPixel*, int width, int height);
 
+sgCounters sgGetCounters(const swgfx*);
+
 void sgCheck(swgfx*);
diff --git a/src/swgfx.c b/src/swgfx.c
index bbf9a5b..78d5434 100644
--- a/src/swgfx.c
+++ b/src/swgfx.c
@@ -19,6 +19,8 @@ Coordinate systems:
 #include <stdint.h>
 #include <string.h>
 
+
+
 static constexpr sgVec3 Up3 = (sgVec3){0,1,0};
 
 typedef struct sgViewport_t { int x0, y0, width, height; } sgViewport_t;
@@ -50,6 +52,7 @@ typedef struct swgfx {
   sgTextureFilter textureFilter;  // Filter method for the texture.
   sgImage         defaultTexture; // A default for when no texture is provided.
   sgPixel         defaultPixel;   // The single-pixel of the default texture.
+  sgCounters      counters;
 } swgfx;
 
 static inline int mod(int a, int m) { return (m + (a % m)) % m; }
@@ -306,6 +309,9 @@ static inline R* Depth(swgfx* gfx, int x, int y) {
 static inline void SetPixel(swgfx* gfx, const sgVec2i p, sgPixel colour) {
   assert(gfx);
   *Pixel(gfx, p.x, p.y) = colour;
+#if SWGFX_PROFILING
+  gfx->counters.pixels++;
+#endif // SWGFX_PROFILING
 }
 
 static inline void SetDepth(swgfx* gfx, const sgVec2i p, R depth) {
@@ -448,6 +454,9 @@ static void DrawTriangle2(swgfx* gfx, const sgTri2* const tri) {
       }
     }
   }
+#if SWGFX_PROFILING
+  gfx->counters.triangles2++;
+#endif // SWGFX_PROFILING
 }
 
 static inline sgVec4 PerspDivide(sgVec4 v) {
@@ -677,6 +686,9 @@ static void DrawTriangle3(swgfx* gfx, const sgTri3* const tri) {
   for (int i = 0; i < numTris; ++i) {
     DrawTriangle3PostClip(gfx, &tris[i]);
   }
+#if SWGFX_PROFILING
+  gfx->counters.triangles3++;
+#endif // SWGFX_PROFILING
 }
 
 #define is_pow2_or_0(X) ((X & (X - 1)) == 0)
@@ -768,6 +780,10 @@ void sgPresent(swgfx* gfx, sgVec2i dimensions, sgScreenPixel* screen) {
       }
     }
   }
+
+#if SWGFX_PROFILING
+  gfx->counters.frames++;
+#endif // SWGFX_PROFILING
 }
 
 static void sgUpdateViewProjection(swgfx* gfx) {
@@ -930,6 +946,11 @@ static bool ViewportWithinBuffer(swgfx* gfx) {
          ((vp.y0 + vp.height) <= gfx->dims.y);
 }
 
+sgCounters sgGetCounters(const swgfx* gfx) {
+  assert(gfx);
+  return gfx->counters;
+}
+
 void sgCheck(swgfx* gfx) {
   assert(gfx);
   assert(ViewportWithinBuffer(gfx));