lovr.graphics.prepare;

src/graphics/buffer.c

@@ -1,4 +1,5 @@
 #include "buffer.h"
+#include "graphics.h"
 #include "../util.h"
 #include <stdlib.h>
 
@@ -11,6 +12,7 @@ void lovrBufferDestroy(Buffer* buffer) {
 }
 
 void lovrBufferDraw(Buffer* buffer) {
+  lovrGraphicsPrepare();
   glBindVertexArray(buffer->vao);
   glEnableVertexAttribArray(0);
   int usingIbo = buffer->map.length > 0;

src/graphics/graphics.c

@@ -13,6 +13,7 @@
 typedef struct {
   Shader* activeShader;
   vec_mat4_t transforms;
+  mat4 lastTransform;
 } GraphicsState;
 
 static GraphicsState graphicsState;
@@ -20,6 +21,8 @@ static GraphicsState graphicsState;
 void lovrGraphicsInit() {
   vec_init(&graphicsState.transforms);
   vec_push(&graphicsState.transforms, mat4_init());
+  graphicsState.lastTransform = mat4_init();
+  memset(graphicsState.lastTransform, 0, 16);
 }
 
 void lovrGraphicsClear(int color, int depth) {
@@ -40,6 +43,25 @@ void lovrGraphicsPresent() {
   glfwSwapBuffers(window);
 }
 
+void lovrGraphicsPrepare() {
+  Shader* shader = lovrGraphicsGetShader();
+
+  if (!shader) {
+    return;
+  }
+
+  mat4 transform = vec_last(&graphicsState.transforms);
+  mat4 lastTransform = graphicsState.lastTransform;
+
+  if (!memcmp(transform, lastTransform, 16 * sizeof(float))) {
+    return;
+  }
+
+  int uniformId = lovrShaderGetUniformId(shader, "lovrTransform");
+  lovrShaderSendFloatMat4(shader, uniformId, transform);
+  memcpy(lastTransform, transform, 16 * sizeof(float));
+}
+
 void lovrGraphicsGetClearColor(float* r, float* g, float* b, float* a) {
   GLfloat clearColor[4];
   glGetFloatv(GL_COLOR_CLEAR_VALUE, clearColor);

src/graphics/graphics.h

@@ -11,6 +11,7 @@ typedef vec_t(mat4) vec_mat4_t;
 void lovrGraphicsInit();
 void lovrGraphicsClear(int color, int depth);
 void lovrGraphicsPresent();
+void lovrGraphicsPrepare();
 void lovrGraphicsGetClearColor(float* r, float* g, float* b, float* a);
 void lovrGraphicsSetClearColor(float r, float g, float b, float a);
 Shader* lovrGraphicsGetShader();