Ritchie Cunningham
d37f632344
This mirrors the previous refactor of the TextRenderer. All calls to draw_rect and draw_triangle now buffer vertex data (position and color). A begin()/flush() system is introduced to manage batching.
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
#include <GL/glew.h>
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#include "shape_renderer.h"
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#include "debug/debug_stats.h"
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#include "math/math.h"
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ShapeRenderer::ShapeRenderer(unsigned int screen_width, unsigned int screen_height) {
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math::ortho_proj(_projection, 0.0f, (float)screen_width, 0.0f, (float)screen_height, -1.0f, 1.0f);
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/* Load shader. */
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_shape_shader = new Shader("assets/shaders/shape.vert",
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"assets/shaders/shape.frag");
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_shape_shader->use();
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_shape_shader->set_mat4("projection", _projection);
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/* Configure VAO/VBO for batch rendering. */
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glGenVertexArrays(1, &_vao);
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glGenBuffers(1, &_vbo);
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glBindVertexArray(_vao);
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glBindBuffer(GL_ARRAY_BUFFER, _vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(ShapeVertex) * MAX_SHAPE_VERTICES, nullptr, GL_DYNAMIC_DRAW);
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/* Position attribute. */
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(ShapeVertex), (void*)0);
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/* Colour attribute. */
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(ShapeVertex), (void*)offsetof(ShapeVertex, r));
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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_vertices.reserve(MAX_SHAPE_VERTICES);
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}
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ShapeRenderer::~ShapeRenderer(void) {
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delete _shape_shader;
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}
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void ShapeRenderer::begin(void) {
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_vertices.clear();
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}
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void ShapeRenderer::flush(void) {
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if(_vertices.empty()) return;
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_shape_shader->use();
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glBindVertexArray(_vao);
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glBindBuffer(GL_ARRAY_BUFFER, _vbo);
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glBufferSubData(GL_ARRAY_BUFFER, 0, _vertices.size() * sizeof(ShapeVertex), _vertices.data());
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DebugStats::draw_calls++;
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DebugStats::shape_vertices += _vertices.size();
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glDrawArrays(GL_TRIANGLES, 0, _vertices.size());
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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}
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void ShapeRenderer::draw_rect(int x, int y, int width, int height, const Color& color) {
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float x_f = (float)x;
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float y_f = (float)y;
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float w_f = (float)width;
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float h_f = (float)height;
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_vertices.push_back({x_f, y_f+h_f, color.r, color.g, color.b});
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_vertices.push_back({x_f, y_f, color.r, color.g, color.b});
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_vertices.push_back({x_f+w_f, y_f, color.r, color.g, color.b});
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_vertices.push_back({x_f, y_f+h_f, color.r, color.g, color.b});
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_vertices.push_back({x_f+w_f, y_f, color.r, color.g, color.b});
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_vertices.push_back({x_f+w_f, y_f+h_f, color.r, color.g, color.b});
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}
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void ShapeRenderer::draw_triangle(int x1, int y1, int x2, int y2, int x3,
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int y3, const Color& color) {
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_vertices.push_back({(float)x1, (float)y1, color.r, color.g, color.b});
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_vertices.push_back({(float)x2, (float)y2, color.r, color.g, color.b});
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_vertices.push_back({(float)x3, (float)y3, color.r, color.g, color.b});
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}
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