From 93f007f329df5be67a5019152deb0d613a26c13b Mon Sep 17 00:00:00 2001
From: bjorn <tie.372@gmail.com>
Date: Thu, 29 Sep 2016 00:00:02 -0700
Subject: [PATCH] Shape infrastructure;

---
 src/graphics/graphics.c | 19 +++++++++++++++++++
 src/graphics/graphics.h |  5 +++++
 2 files changed, 24 insertions(+)

diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index e7bff23c..12c48c75 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -21,6 +21,9 @@ void lovrGraphicsInit() {
   state.lastProjection = mat4_init();
   state.defaultShader = lovrGraphicsNewShader(lovrDefaultVertexShader, lovrDefaultFragmentShader);
   state.lastColor = LOVR_COLOR(255, 255, 255, 255);
+  glGenBuffers(1, &state.shapeBuffer);
+  glGenVertexArrays(1, &state.shapeArray);
+  vec_init(&state.shapeData);
   lovrGraphicsReset();
 }
 
@@ -227,6 +230,22 @@ void lovrGraphicsGetDimensions(int* width, int* height) {
   glfwGetFramebufferSize(window, width, height);
 }
 
+void lovrGraphicsSetShapeData(float* data, int count) {
+  vec_clear(&state.shapeData);
+  vec_pusharr(&state.shapeData, data, count);
+  glBindVertexArray(state.shapeArray);
+  glBindBuffer(GL_ARRAY_BUFFER, state.shapeBuffer);
+  glBufferData(GL_ARRAY_BUFFER, count * sizeof(float), data, GL_STREAM_DRAW);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
+}
+
+void lovrGraphicsDrawShape() {
+  lovrGraphicsPrepare();
+  glBindVertexArray(state.shapeArray);
+  glEnableVertexAttribArray(0);
+  glDrawArrays(GL_TRIANGLE_FAN, 0, state.shapeData.length / 3);
+}
+
 Buffer* lovrGraphicsNewBuffer(int size, BufferDrawMode drawMode, BufferUsage usage) {
   Buffer* buffer = malloc(sizeof(Buffer));
 
diff --git a/src/graphics/graphics.h b/src/graphics/graphics.h
index b6a86499..3362c4c8 100644
--- a/src/graphics/graphics.h
+++ b/src/graphics/graphics.h
@@ -32,6 +32,9 @@ typedef struct {
   unsigned char colorMask;
   char isScissorEnabled;
   ScissorRectangle scissor;
+  GLuint shapeArray;
+  GLuint shapeBuffer;
+  vec_float_t shapeData;
 } GraphicsState;
 #endif
 
@@ -61,6 +64,8 @@ void lovrGraphicsTranslate(float x, float y, float z);
 void lovrGraphicsRotate(float w, float x, float y, float z);
 void lovrGraphicsScale(float x, float y, float z);
 void lovrGraphicsGetDimensions(int* width, int* height);
+void lovrGraphicsSetShapeData(float* data, int count);
+void lovrGraphicsDrawShape();
 Buffer* lovrGraphicsNewBuffer(int size, BufferDrawMode drawMode, BufferUsage usage);
 Model* lovrGraphicsNewModel(const char* path);
 Shader* lovrGraphicsNewShader(const char* vertexSource, const char* fragmentSource);