112 lines
2.2 KiB
C++
112 lines
2.2 KiB
C++
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#include <GL/glew.h>
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#include <GLFW/glfw3.h>
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#include <iostream>
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#include "shader.hpp"
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#include "window.hpp"
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using namespace sim::graphics;
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static const char* VERTEX_SHADER = R"(
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#version 460 core
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#extension GL_ARB_bindless_texture : require
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layout (location = 0) in sampler2D aTex;
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layout (location = 1) in vec2 aTexPos;
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layout (location = 2) in vec3 aPos;
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layout (location = 3) in vec3 aNormal;
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uniform mat4 model;
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uniform mat4 projection;
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out float brightness;
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out flat sampler2D tex;
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out vec2 texPos;
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void main()
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{
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vec4 pos = model * vec4(aPos, 1.0);
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vec3 cNormal = vec3(0.f, 0.f, 1.f) * mat3(model);
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brightness = dot(normalize(aNormal), normalize(cNormal)) * 0.25f + 0.75f;
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gl_Position = projection * pos;
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texPos = aTexPos;
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tex = aTex;
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}
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)";
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static const char* FRAGMENT_SHADER = R"(
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#version 460 core
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#extension GL_ARB_bindless_texture : require
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in float brightness;
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in flat sampler2D tex;
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in vec2 texPos;
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out vec4 FragColour;
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uniform mat4 tex_mat;
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void main()
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{
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vec4 texdata = texture2D(tex, texPos);
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FragColour = tex_mat * texdata * vec4(vec3(brightness), 1);
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if(FragColour.a == 0) discard;
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}
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)";
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static unsigned int prog_id;
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int shader::gl_tex_mat;
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int shader::gl_model;
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int shader::gl_projection;
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static int load_shader(const char** src, int type)
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{
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int id = glCreateShader(type);
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glShaderSource(id, 1, src, nullptr);
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glCompileShader(id);
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return id;
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}
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unsigned int shader::init_program()
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{
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int success;
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int vsh_id = load_shader(&VERTEX_SHADER, GL_VERTEX_SHADER);
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int fsh_id = load_shader(&FRAGMENT_SHADER, GL_FRAGMENT_SHADER);
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prog_id = glCreateProgram();
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glAttachShader(prog_id, vsh_id);
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glAttachShader(prog_id, fsh_id);
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glLinkProgram(prog_id);
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glGetProgramiv(prog_id, GL_LINK_STATUS, &success);
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if(!success)
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{
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char infoLog[512];
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glGetProgramInfoLog(prog_id, 512, NULL, infoLog);
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std::cout << "Shader Link Error: " << infoLog << std::endl;
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window::close();
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return 0;
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}
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gl_tex_mat = glGetUniformLocation(prog_id, "tex_mat");
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gl_model = glGetUniformLocation(prog_id, "model");
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gl_projection = glGetUniformLocation(prog_id, "projection");
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glUseProgram(prog_id);
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glDeleteShader(vsh_id);
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glDeleteShader(fsh_id);
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return prog_id;
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}
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