diff options
Diffstat (limited to 'src/spritebatch.cpp')
| -rw-r--r-- | src/spritebatch.cpp | 165 |
1 files changed, 134 insertions, 31 deletions
diff --git a/src/spritebatch.cpp b/src/spritebatch.cpp index 1abcc567..8a08ea86 100644 --- a/src/spritebatch.cpp +++ b/src/spritebatch.cpp @@ -1,14 +1,30 @@ #include "spritebatch.hpp" #include <algorithm> +#include <stdexcept> namespace yage { +const int SpriteBatch::NUM_VERTICES; + +Glyph::Glyph(GLuint texture, float depth, const Vertex &top_left, const Vertex &top_right, const Vertex &bottom_right, const Vertex &bottom_left) : + texture_(texture), + depth_(depth), + top_left_(top_left), + top_right_(top_right), + bottom_right_(bottom_right), + bottom_left_(bottom_left) +{} + +RenderBatch::RenderBatch(GLint offset, GLsizei num_vertices, GLuint texture) : + offset_(offset), + num_vertices_(num_vertices), + texture_(texture) +{} + SpriteBatch::SpriteBatch() -{ - createVertexArray(); -} +{} SpriteBatch::~SpriteBatch() { @@ -19,48 +35,135 @@ SpriteBatch::~SpriteBatch() glDeleteVertexArrays(1, &vbo_); } +void SpriteBatch::init() +{ + createVertexArray(); +} + void SpriteBatch::begin() -{} +{ + glyphs_.clear(); + glyph_ptrs_.clear(); + render_batches_.clear(); +} void SpriteBatch::end() -{} +{ + sortGlyphs(); + createRenderBatches(); +} void SpriteBatch::draw(const glm::vec4 &destination_rect, const glm::vec4 &uv_rect, GLuint texture, const Color &color, float depth) { - Glyph new_glyph; - new_glyph.texture=texture; - new_glyph.depth=depth; - - new_glyph.top_left.color=color; - new_glyph.top_left.setPosition(destination_rect.x, destination_rect.y+destination_rect.w); - new_glyph.top_left.setUv(uv_rect.x, uv_rect.y+uv_rect.w); - - new_glyph.top_right.color=color; - new_glyph.top_right.setPosition(destination_rect.x+destination_rect.z, destination_rect.y+destination_rect.w); - new_glyph.top_right.setUv(uv_rect.x+uv_rect.z, uv_rect.y+uv_rect.w); - - new_glyph.bottom_right.color=color; - new_glyph.bottom_right.setPosition(destination_rect.x+destination_rect.z, destination_rect.y); - new_glyph.bottom_right.setUv(uv_rect.x+uv_rect.z, uv_rect.y); + Vertex top_left, top_right, bottom_right, bottom_left; + + top_left.color=color; + top_left.setPosition(destination_rect.x, destination_rect.y+destination_rect.w); + top_left.setUv(uv_rect.x, uv_rect.y+uv_rect.w); + + top_right.color=color; + top_right.setPosition(destination_rect.x+destination_rect.z, destination_rect.y+destination_rect.w); + top_right.setUv(uv_rect.x+uv_rect.z, uv_rect.y+uv_rect.w); + + bottom_right.color=color; + bottom_right.setPosition(destination_rect.x+destination_rect.z, destination_rect.y); + bottom_right.setUv(uv_rect.x+uv_rect.z, uv_rect.y); + + bottom_left.color=color; + bottom_left.setPosition(destination_rect.x, destination_rect.y); + bottom_left.setUv(uv_rect.x, uv_rect.y); + + // deal with fragmenting by creating vector of pointers + glyphs_.emplace_back(texture, depth, top_left, top_right, bottom_right, bottom_left); + glyph_ptrs_.push_back(&glyphs_.back()); +} - new_glyph.bottom_right.color=color; - new_glyph.bottom_right.setPosition(destination_rect.x, destination_rect.y); - new_glyph.bottom_right.setUv(uv_rect.x, uv_rect.y); +void SpriteBatch::render() +{ + glBindVertexArray(vao_); + for(auto &&batch : render_batches_) + { + glBindTexture(GL_TEXTURE_2D, batch.texture()); + glDrawArrays(GL_TRIANGLES, batch.offset(), batch.num_vertices()); + } + glBindVertexArray(0); +} - // deal with fragmenting - glyphs_.push_back(new_glyph); - glyph_ptrs_.push_back(&glyphs_.back()); +void SpriteBatch::createVertexArray() +{ + if(vao_==0) + { + glGenVertexArrays(1, &vao_); + if(vao_==0) + throw std::runtime_error("glGenVertexArrays failed"); + } + // bind vertex array object + glBindVertexArray(vao_); + + if(vbo_==0) + { + glGenBuffers(1, &vbo_); + if(vbo_==0) + throw std::runtime_error("glGenBuffers failed"); + } + // bind vertex buffer object + glBindBuffer(GL_ARRAY_BUFFER, vbo_); + + // enable vertex attribute arrays + glEnableVertexAttribArray(0); + glEnableVertexAttribArray(1); + glEnableVertexAttribArray(2); + + // set the vertex attribute pointers + glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)offsetof(Vertex, position)); + glVertexAttribPointer(1, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(Vertex), (void *)offsetof(Vertex, color)); + glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)offsetof(Vertex, uv)); + glDrawArrays(GL_TRIANGLES, 0, 6); + + // unbind vertex array object + glBindVertexArray(0); } -void SpriteBatch::renderBatch() -{} +void SpriteBatch::createRenderBatches() +{ + std::vector<Vertex> vertices; + if(glyph_ptrs_.empty()) + return; + + render_batches_.reserve(glyph_ptrs_.size()*NUM_VERTICES); + + for(int i=0; i<(int)glyph_ptrs_.size(); ++i) + { + if(i==0 || (i>0 && (glyph_ptrs_[i]->texture()!=glyph_ptrs_[i-1]->texture()))) + render_batches_.emplace_back(i*NUM_VERTICES, NUM_VERTICES, glyph_ptrs_[i]->texture()); + else + render_batches_.back().offset_+=NUM_VERTICES; + + vertices.push_back(glyph_ptrs_[i]->bottom_left()); + vertices.push_back(glyph_ptrs_[i]->top_left()); + vertices.push_back(glyph_ptrs_[i]->top_right()); + vertices.push_back(glyph_ptrs_[i]->bottom_left()); + vertices.push_back(glyph_ptrs_[i]->bottom_right()); + vertices.push_back(glyph_ptrs_[i]->top_right()); + + // bind vbo + glBindBuffer(GL_ARRAY_BUFFER, vbo_); + // orphan the buffer + glBufferData(GL_ARRAY_BUFFER, vertices.size()*sizeof(Vertex), nullptr, GL_DYNAMIC_DRAW); + // upload the data + glBufferSubData(GL_ARRAY_BUFFER, 0, vertices.size()*sizeof(Vertex), vertices.data()); + // unbind buffer + glBindBuffer(GL_ARRAY_BUFFER, 0); + } +} void SpriteBatch::sortGlyphs() { + // sort using introsort or quicksort std::sort(glyph_ptrs_.begin(), glyph_ptrs_.end(), [] (Glyph *a, Glyph *b)->bool { - if(a->depth==b->depth) - return a->texture<b->texture; - return a->depth<b->depth; + if(a->depth()==b->depth()) + return a->texture()<b->texture(); + return a->depth()<b->depth(); }); } |