use indices for model rendering

[blank.git] / src / model.cpp

diff --git a/src/model.cpp b/src/model.cpp
index 08b29242b1b185a90c60d54ec59e3b58b2fa4edf..0e358c5585c62300d9a7aae3abe0e52da8a18863 100644 (file)
--- a/src/model.cpp
+++ b/src/model.cpp
@@ -33,6 +33,7 @@ Model &Model::operator =(Model &&other) {
        vertices = std::move(other.vertices);
        colors = std::move(other.colors);
        normals = std::move(other.normals);
+       indices = std::move(other.indices);
        for (int i = 0; i < ATTRIB_COUNT; ++i) {
                std::swap(handle[i], other.handle[i]);
        }
@@ -45,13 +46,15 @@ void Model::Clear() {
        vertices.clear();
        colors.clear();
        normals.clear();
+       indices.clear();
        Invalidate();
 }
 
-void Model::Reserve(int s) {
-       vertices.reserve(s);
-       colors.reserve(s);
-       normals.reserve(s);
+void Model::Reserve(int v, int i) {
+       vertices.reserve(v);
+       colors.reserve(v);
+       normals.reserve(v);
+       indices.reserve(i);
 }
 
 
@@ -77,6 +80,9 @@ void Model::Update() {
        glBindBuffer(GL_ARRAY_BUFFER, handle[ATTRIB_NORMAL]);
        glBufferData(GL_ARRAY_BUFFER, normals.size() * sizeof(glm::vec3), normals.data(), GL_STATIC_DRAW);
 
+       glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle[ATTRIB_INDEX]);
+       glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(Index), indices.data(), GL_STATIC_DRAW);
+
        dirty = false;
 }
 
@@ -119,10 +125,12 @@ void Model::Draw() {
                nullptr        // offset
        );
 
-       glDrawArrays(
-               GL_TRIANGLES,   // how
-               0,              // start
-               vertices.size() // len
+       glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle[ATTRIB_INDEX]);
+       glDrawElements(
+               GL_TRIANGLES,      // how
+               indices.size(),    // count
+               GL_UNSIGNED_INT, // type
+               nullptr            // offset
        );
 
        glDisableVertexAttribArray(ATTRIB_NORMAL);
@@ -134,6 +142,7 @@ void Model::Draw() {
 OutlineModel::OutlineModel()
 : vertices()
 , colors()
+, indices()
 , handle{}
 , dirty(false) {
        glGenBuffers(ATTRIB_COUNT, handle);
@@ -147,12 +156,14 @@ OutlineModel::~OutlineModel() {
 void OutlineModel::Clear() {
        vertices.clear();
        colors.clear();
+       indices.clear();
        Invalidate();
 }
 
-void OutlineModel::Reserve(int s) {
-       vertices.reserve(s);
-       colors.reserve(s);
+void OutlineModel::Reserve(int v, int i) {
+       vertices.reserve(v);
+       colors.reserve(v);
+       indices.reserve(i);
 }
 
 
@@ -169,6 +180,9 @@ void OutlineModel::Update() {
        glBindBuffer(GL_ARRAY_BUFFER, handle[ATTRIB_COLOR]);
        glBufferData(GL_ARRAY_BUFFER, colors.size() * sizeof(glm::vec3), colors.data(), GL_STATIC_DRAW);
 
+       glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle[ATTRIB_INDEX]);
+       glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(Index), indices.data(), GL_STATIC_DRAW);
+
        dirty = false;
 }
 
@@ -203,10 +217,12 @@ void OutlineModel::Draw() {
        glEnable(GL_LINE_SMOOTH);
        glLineWidth(2.0f);
 
-       glDrawArrays(
-               GL_LINES,       // how
-               0,              // start
-               vertices.size() // len
+       glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle[ATTRIB_INDEX]);
+       glDrawElements(
+               GL_LINES,          // how
+               indices.size(),    // count
+               GL_UNSIGNED_SHORT, // type
+               nullptr            // offset
        );
 
        glDisableVertexAttribArray(ATTRIB_COLOR);