Pass:send supports push constants;

src/api/api.h

@@ -152,6 +152,7 @@ void* luax_readfile(const char* filename, size_t* bytesRead);
 
 #ifndef LOVR_DISABLE_GRAPHICS
 struct Buffer;
+void luax_readbufferfield(struct lua_State* L, int index, int type, void* data);
 void luax_readbufferdata(struct lua_State* L, int index, struct Buffer* buffer, char* data);
 uint32_t luax_checkcomparemode(struct lua_State* L, int index);
 #endif

src/api/l_graphics_buffer.c

@@ -61,7 +61,7 @@ typedef union {
   float* f32;
 } FieldPointer;
 
-static void luax_readbufferfield(lua_State* L, int index, int type, void* data) {
+void luax_readbufferfield(lua_State* L, int index, int type, void* data) {
   FieldPointer p = { .raw = data };
   if (lua_isuserdata(L, index)) {
     VectorType vectorType;

src/api/l_graphics_pass.c

@@ -337,7 +337,15 @@ static int l_lovrPassSend(lua_State* L) {
     return 0;
   }
 
-  return luax_typeerror(L, 3, "Buffer, Texture, Sampler, or number/vector");
+  if (!name) {
+    return luax_typeerror(L, 3, "Buffer, Texture, or Sampler");
+  }
+
+  void* data;
+  FieldType type;
+  lovrPassSendValue(pass, name, length, &data, &type);
+  luax_readbufferfield(L, 3, type, data);
+  return 0;
 }
 
 static uint32_t luax_getvertexcount(lua_State* L, int index) {

src/modules/graphics/graphics.c

@@ -1889,6 +1889,22 @@ void lovrPassSendSampler(Pass* pass, const char* name, size_t length, uint32_t s
   pass->bindingsDirty = true;
 }
 
+void lovrPassSendValue(Pass* pass, const char* name, size_t length, void** data, FieldType* type) {
+  Shader* shader = pass->pipeline->shader;
+  lovrCheck(shader, "A Shader must be active to send resources");
+
+  uint32_t hash = (uint32_t) hash64(name, length);
+  for (uint32_t i = 0; i < shader->constantCount; i++) {
+    if (shader->constants[i].hash == hash) {
+      *data = (char*) pass->constants + shader->constants[i].offset;
+      *type = shader->constants[i].type;
+      pass->constantsDirty = true;
+    }
+  }
+
+  lovrThrow("Shader has no push constant named '%s'", name);
+}
+
 static void flushPipeline(Pass* pass, Draw* draw, Shader* shader) {
   Pipeline* pipeline = pass->pipeline;
 

src/modules/graphics/graphics.h

@@ -388,6 +388,7 @@ void lovrPassSetWireframe(Pass* pass, bool wireframe);
 void lovrPassSendBuffer(Pass* pass, const char* name, size_t length, uint32_t slot, Buffer* buffer, uint32_t offset, uint32_t extent);
 void lovrPassSendTexture(Pass* pass, const char* name, size_t length, uint32_t slot, Texture* texture);
 void lovrPassSendSampler(Pass* pass, const char* name, size_t length, uint32_t slot, Sampler* sampler);
+void lovrPassSendValue(Pass* pass, const char* name, size_t length, void** data, FieldType* type);
 void lovrPassPoints(Pass* pass, uint32_t count, float** vertices);
 void lovrPassLine(Pass* pass, uint32_t count, float** vertices);
 void lovrPassPlane(Pass* pass, float* transform, uint32_t cols, uint32_t rows);