294 lines
9.5 KiB
C++
294 lines
9.5 KiB
C++
/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 10.11.2017
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*
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* OpenGL render implementation
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*
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*/
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// TOP
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//#define GL_FUNC(N,R,P) typedef R (N##_Function) P; N##_Function *P = 0;
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//#include "4ed_opengl_funcs.h"
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#include "4ed_opengl_defines.h"
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internal void
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gl__bind_texture(Render_Target *t, i32 texid){
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if (t->bound_texture != texid){
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glBindTexture(GL_TEXTURE_2D_ARRAY, texid);
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t->bound_texture = texid;
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}
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}
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internal void
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gl__bind_any_texture(Render_Target *t){
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if (t->bound_texture == 0){
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Assert(t->fallback_texture_id != 0);
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glBindTexture(GL_TEXTURE_2D_ARRAY, t->fallback_texture_id);
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t->bound_texture = t->fallback_texture_id;
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}
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}
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internal u32
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gl__get_texture(Vec3_i32 dim, Texture_Kind texture_kind){
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u32 tex = 0;
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glGenTextures(1, &tex);
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glBindTexture(GL_TEXTURE_2D_ARRAY, tex);
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glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_R8, dim.x, dim.y, dim.z, 0, GL_RED, GL_UNSIGNED_BYTE, 0);
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glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 0);
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return(tex);
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}
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internal b32
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gl__fill_texture(Texture_Kind texture_kind, u32 texture, Vec3_i32 p, Vec3_i32 dim, void *data){
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b32 result = false;
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if (texture != 0){
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glBindTexture(GL_TEXTURE_2D_ARRAY, texture);
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}
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if (dim.x > 0 && dim.y > 0 && dim.z > 0){
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, p.x, p.y, p.z, dim.x, dim.y, dim.z, GL_RED, GL_UNSIGNED_BYTE, data);
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}
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return(result);
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}
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internal void CALL_CONVENTION
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gl__error_callback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, char *message, void *userParam){
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InvalidPath;
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}
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char *gl__header = R"foo(#version 150
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)foo";
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char *gl__vertex = R"foo(
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uniform vec2 view_t;
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uniform mat2x2 view_m;
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in vec2 vertex_p;
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in vec3 vertex_t;
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in vec4 vertex_c;
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smooth out vec4 fragment_color;
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smooth out vec3 uvw;
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void main(void)
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{
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gl_Position = vec4(view_m*(vertex_p - view_t), 0.f, 1.f);
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fragment_color = vertex_c;
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uvw = vertex_t;
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}
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)foo";
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char *gl__fragment = R"foo(
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smooth in vec4 fragment_color;
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smooth in vec3 uvw;
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uniform sampler2DArray sampler;
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out vec4 out_color;
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void main(void)
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{
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out_color = vec4(fragment_color.xyz, fragment_color.a*texture(sampler, uvw).r);
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}
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)foo";
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#define AttributeList(X) \
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X(vertex_p) \
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X(vertex_t) \
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X(vertex_c)
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#define UniformList(X) \
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X(view_t) \
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X(view_m) \
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X(sampler)
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struct GL_Program{
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u32 program;
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#define GetAttributeLocation(N) i32 N;
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AttributeList(GetAttributeLocation)
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#undef GetAttributeLocation
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#define GetUniformLocation(N) i32 N;
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UniformList(GetUniformLocation)
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#undef GetUniformLocation
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};
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internal GL_Program
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gl__make_program(char *header, char *vertex, char *fragment){
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if (header == 0){
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header = "";
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}
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GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
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GLchar *vertex_source_array[] = { header, vertex };
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glShaderSource(vertex_shader, ArrayCount(vertex_source_array), vertex_source_array, 0);
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glCompileShader(vertex_shader);
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GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
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GLchar *fragment_source_array[] = { header, fragment };
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glShaderSource(fragment_shader, ArrayCount(fragment_source_array), fragment_source_array, 0);
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glCompileShader(fragment_shader);
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GLuint program = glCreateProgram();
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glAttachShader(program, vertex_shader);
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glAttachShader(program, fragment_shader);
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glLinkProgram(program);
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glValidateProgram(program);
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GLint success = false;
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glGetProgramiv(program, GL_LINK_STATUS, &success);
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if (!success){
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GLsizei ignore = 0;
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char vertex_errors[KB(4)];
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char fragment_errors[KB(4)];
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char program_errors[KB(4)];
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glGetShaderInfoLog(vertex_shader, sizeof(vertex_errors), &ignore, vertex_errors);
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glGetShaderInfoLog(fragment_shader, sizeof(fragment_errors), &ignore, fragment_errors);
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glGetProgramInfoLog(program, sizeof(program_errors), &ignore, program_errors);
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#if SHIP_MODE
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os_popup_window(string_u8_litexpr("Error"), string_u8_litexpr("Shader compilation failed."));
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#endif
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InvalidPath;
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}
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glDeleteShader(vertex_shader);
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glDeleteShader(fragment_shader);
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GL_Program result = {};
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result.program = program;
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#define GetAttributeLocation(N) result.N = glGetAttribLocation(program, #N);
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AttributeList(GetAttributeLocation)
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#undef GetAttributeLocation
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#define GetUniformLocation(N) result.N = glGetUniformLocation(program, #N);
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UniformList(GetUniformLocation)
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#undef GetUniformLocation
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return(result);
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}
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#define GLOffsetStruct(p,m) ((void*)(OffsetOfMemberStruct(p,m)))
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#define GLOffset(S,m) ((void*)(OffsetOfMember(S,m)))
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internal void
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gl_render(Render_Target *t, Arena *scratch){
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Font_Set *font_set = (Font_Set*)t->font_set;
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local_persist b32 first_opengl_call = true;
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local_persist u32 attribute_buffer = 0;
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local_persist GL_Program gpu_program = {};
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if (first_opengl_call){
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first_opengl_call = false;
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#if !SHIP_MODE
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glEnable(GL_DEBUG_OUTPUT);
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glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
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glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_NOTIFICATION, 0, 0, false);
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glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_LOW, 0, 0, true);
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glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_MEDIUM, 0, 0, true);
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glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DEBUG_SEVERITY_HIGH, 0, 0, true);
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glDebugMessageCallback(gl__error_callback, 0);
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#endif
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////////////////////////////////
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GLuint dummy_vao = 0;
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glGenVertexArrays(1, &dummy_vao);
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glBindVertexArray(dummy_vao);
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////////////////////////////////
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glGenBuffers(1, &attribute_buffer);
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glBindBuffer(GL_ARRAY_BUFFER, attribute_buffer);
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////////////////////////////////
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glEnable(GL_SCISSOR_TEST);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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////////////////////////////////
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gpu_program = gl__make_program(gl__header, gl__vertex, gl__fragment);
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glUseProgram(gpu_program.program);
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////////////////////////////////
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{
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t->fallback_texture_id = gl__get_texture(V3i32(2, 2, 1), TextureKind_Mono);
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u8 white_block[] = { 0xFF, 0xFF, 0xFF, 0xFF, };
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gl__fill_texture(TextureKind_Mono, 0, V3i32(0, 0, 0), V3i32(2, 2, 1), white_block);
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}
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}
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i32 width = t->width;
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i32 height = t->height;
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glViewport(0, 0, width, height);
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glScissor(0, 0, width, height);
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glClearColor(1.f, 0.f, 1.f, 1.f);
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glClear(GL_COLOR_BUFFER_BIT);
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glBindTexture(GL_TEXTURE_2D, 0);
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t->bound_texture = 0;
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for (Render_Free_Texture *free_texture = t->free_texture_first;
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free_texture != 0;
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free_texture = free_texture->next){
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glDeleteTextures(1, &free_texture->tex_id);
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}
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t->free_texture_first = 0;
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t->free_texture_last = 0;
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for (Render_Group *group = t->group_first;
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group != 0;
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group = group->next){
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Rect_i32 box = group->clip_box;
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glScissor(box.x0, height - box.y1, box.x1 - box.x0, box.y1 - box.y0);
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i32 vertex_count = group->vertex_list.vertex_count;
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if (vertex_count > 0){
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Face *face = font_set_face_from_id(font_set, group->face_id);
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if (face != 0){
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gl__bind_texture(t, face->texture);
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}
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else{
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gl__bind_any_texture(t);
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}
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glBufferData(GL_ARRAY_BUFFER, vertex_count*sizeof(Render_Vertex), 0, GL_STREAM_DRAW);
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i32 cursor = 0;
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for (Render_Vertex_Array_Node *node = group->vertex_list.first;
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node != 0;
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node = node->next){
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i32 size = node->vertex_count*sizeof(*node->vertices);
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glBufferSubData(GL_ARRAY_BUFFER, cursor, size, node->vertices);
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cursor += size;
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}
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glEnableVertexAttribArray(gpu_program.vertex_p);
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glEnableVertexAttribArray(gpu_program.vertex_t);
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glEnableVertexAttribArray(gpu_program.vertex_c);
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glVertexAttribPointer(gpu_program.vertex_p, 2, GL_FLOAT, true, sizeof(Render_Vertex), GLOffset(Render_Vertex, xy));
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glVertexAttribPointer(gpu_program.vertex_t, 3, GL_FLOAT, true, sizeof(Render_Vertex), GLOffset(Render_Vertex, uvw));
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glVertexAttribPointer(gpu_program.vertex_c, 4, GL_FLOAT, true, sizeof(Render_Vertex), GLOffset(Render_Vertex, color));
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glUniform2f(gpu_program.view_t, width/2.f, height/2.f);
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f32 m[4] = {
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2.f/width, 0.f,
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0.f, -2.f/height,
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};
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glUniformMatrix2fv(gpu_program.view_m, 1, GL_FALSE, m);
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glUniform1i(gpu_program.sampler, 0);
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glDrawArrays(GL_TRIANGLES, 0, vertex_count);
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glDisableVertexAttribArray(gpu_program.vertex_p);
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glDisableVertexAttribArray(gpu_program.vertex_t);
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glDisableVertexAttribArray(gpu_program.vertex_c);
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}
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}
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glFlush();
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}
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// BOTTOM
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