63 lines
2 KiB
C++
63 lines
2 KiB
C++
#include "mesh.hpp"
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#include "dbc.hpp"
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void Mesh::Draw(Shader &shader) {
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unsigned int diffuseNr = 1;
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unsigned int specularNr = 1;
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unsigned int normalNr = 1;
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unsigned int heightNr = 1;
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for(unsigned int i = 0; i < textures.size(); i++) {
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glActiveTexture(GL_TEXTURE0 + i);
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unsigned int number = 0;
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std::string& name = textures[i].type;
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if(name == "texture_diffuse") {
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number = diffuseNr++;
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} else if(name == "texture_specular") {
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number = specularNr++;
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} else if(name == "texture_normal") {
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number = normalNr++;
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} else if(name == "texture_height") {
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number = heightNr++;
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} else {
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dbc::sentinel($F("Invalid texture type name {}", name));
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}
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std::string target = std::format("{}{}", name, number);
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// TODO: Get this uniform ID once and cache it?
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glUniform1i(glGetUniformLocation(shader.ID, target.c_str()), i);
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glBindTexture(GL_TEXTURE_2D, textures[i].id);
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}
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glBindVertexArray(VAO);
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glDrawElements(GL_TRIANGLES, static_cast<unsigned int>(indices.size()), GL_UNSIGNED_INT, 0);
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glBindVertexArray(0);
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glActiveTexture(GL_TEXTURE0);
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}
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void Mesh::setupMesh() {
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glGenVertexArrays(1, &VAO);
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glGenBuffers(1, &VBO);
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glGenBuffers(1, &EBO);
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), vertices.data(), GL_STATIC_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), indices.data(), GL_STATIC_DRAW);
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// this matches the locations in the vertex shader
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Position));
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Normal));
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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, TexCoords));
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}
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