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#include "Renderer3d.h"
#include "Shader.h"
#include "list.h"
#include "mathlib.h"
#include "WebglContext.h"
#include "Logger.h"
#include <cstdio>
// Note: In the 'transform' attribute, the transform.x is the scale,
// transform.y is the rotation, and transform.zw is the translatiob.
EM_BOOL onScreenSizeChanged_3D(int eventType, const EmscriptenUiEvent *uiEvent, void *userData) {
Renderer3d* renderer = (Renderer3d*)userData;
EMSCRIPTEN_RESULT result = emscripten_set_canvas_element_size( renderer->context->query, uiEvent->documentBodyClientWidth, uiEvent->documentBodyClientHeight);
if (result != EMSCRIPTEN_RESULT_SUCCESS) {
logger_error("Failed to resize element at query: %s\n", renderer->context->query);
}
//renderer->projection = Mat4x4().getOrthographicMatrix(0, renderer->context->width, 0, renderer->context->height);
return true;
}
void Renderer3d::load(WebglContext* inContext, const char* vertexShader, const char* fragmentShader) {
context = inContext;
printf("Compiling Renderer3d shader...\n");
shader = loadShader(vertexShader, fragmentShader);
useShader(shader);
attributes.position = getShaderAttribute(shader, "position");
attributes.color = getShaderAttribute(shader, "color");
attributes.normal = getShaderAttribute(shader, "normal");
uniforms.projection = getShaderUniform(shader, "projection");
uniforms.view = getShaderUniform(shader, "view");
uniforms.model = getShaderUniform(shader, "model");
projection = Mat4x4().getPerspectiveProjection(0.1, 1000.f, 0.872f, static_cast<f32>(context->width) / static_cast<f32>(context->height));
view = Mat4x4().getLookAt({ 0, 25, 75 }, { 0, 15, 0 }, { 0, 1, 0 });
logger_info("Renderer3d shader compiled.\n");
emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, this, false, onScreenSizeChanged_3D);
}
void Renderer3d::render() {
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glDepthMask(GL_TRUE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glClearColor(clearColor.x, clearColor.y, clearColor.z, clearColor.w);
glClearDepth(1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
useShader(shader);
setShaderMat4(uniforms.projection, projection);
setShaderMat4(uniforms.view, view);
}
void Renderer3d::unload() {
glClearColor(0.f, 0.f, 0.f, 0.f);
glClear(GL_COLOR_BUFFER_BIT);
glDeleteProgram(shader);
}
enum LineType {
LineType_None,
LineType_Comment,
LineType_mtl,
LineType_v,
LineType_f,
LineType_Unsupported
};
struct LineItem {
LineType type = LineType_None;
i32 idx = 0;
union {
f32 vertices[3];
i32 indices[3];
} v;
};
inline i32 readPastSpaces(i32 i, const char* content) {
while (content[i] == ' ') i++;
return i;
}
inline i32 readPastLine(i32 i, const char* content) {
while (content[i] != '\n' && content[i] != '\0') i++;
return i;
}
inline i32 readToken(i32 i, const char* content, char* output) {
i32 tidx = 0;
i = readPastSpaces(i, content);
while (content[i] != ' ' && content[i] != '\n' && content[i] != '\0') {
output[tidx] = content[i];
i++;
tidx++;
}
output[tidx] = '\0';
return i;
}
Mesh3d Mesh3d_fromObj(Renderer3d* renderer, const char* content, const i32 len) {
Mesh3d result;
result.vertices.allocate(2048);
result.indices.allocate(2048);
LineItem lt;
lt.type = LineType_None;
i32 lineNumber = 0;
i32 i = 0;
while (content[i] != '\0') {
i = readPastSpaces(i, content);
if (lt.type == LineType_None) {
lineNumber++;
char type[32];
i = readToken(i, content, type);
if (strncmp(type, "#", 1) == 0) {
lt.type = LineType_Comment;
}
else if (strncmp(type, "mtllib", 6) == 0) {
lt.type = LineType_mtl;
}
else if (strncmp(type, "v", 1) == 0) {
lt.type = LineType_v;
}
else if (strncmp(type, "f", 1) == 0) {
lt.type = LineType_f;
}
else {
i++;
//lt.type = LineType_Unsupported;
//logger_error("Unknown type %s, %d", type, lineNumber);
}
}
else {
char buffer[32];
switch (lt.type) {
case LineType_mtl:
i = readToken(i, content, buffer);
break;
case LineType_v: {
while (content[i] != '\n' && content[i] != '\0') {
i = readToken(i, content, buffer);
lt.v.vertices[lt.idx] = atof(buffer);
lt.idx++;
}
float fColor = randomFloatBetween(0.8, 1);
result.vertices.add({
Vector4(lt.v.vertices[0], lt.v.vertices[1], lt.v.vertices[2], 1.f),
Vector4(fColor, fColor, fColor, 1)
});
break;
}
case LineType_f: {
while (content[i] != '\n' && content[i] != '\0') {
i = readToken(i, content, buffer);
lt.v.indices[lt.idx] = atoi(buffer);
lt.idx++;
}
auto v1idx = lt.v.indices[0] - 1;
auto v2idx = lt.v.indices[1] - 1;
auto v3idx = lt.v.indices[2] - 1;
result.indices.add(v1idx);
result.indices.add(v2idx);
result.indices.add(v3idx);
auto& v1 = result.vertices[v1idx];
auto& v2 = result.vertices[v2idx];
auto& v3 = result.vertices[v3idx];
Vector3 normal = (v1.position - v2.position).cross(v1.position - v3.position).toVector3().normalize();
v1.normal = normal;
v2.normal = normal;
v3.normal = normal;
break;
}
default:
i = readPastLine(i, content);
break;
}
lt = LineItem();
}
}
printf("Completed Mesh3d loading.\n");
result.load(renderer);
return result;
}
void Mesh3d::load(Renderer3d* renderer) {
glGenVertexArrays(1, &vao);
glGenBuffers(1, &vbo);
glGenBuffers(1, &ebo);
glBindVertexArray(vao);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, vertices.numElements * sizeof(Vertex3d), &vertices.data[0], GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.numElements * sizeof(GLuint), &indices.data[0], GL_STATIC_DRAW);
// Position
glEnableVertexAttribArray(renderer->attributes.position);
glVertexAttribPointer(renderer->attributes.position, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex3d), (GLvoid *)0);
// Color
glEnableVertexAttribArray(renderer->attributes.color);
glVertexAttribPointer(renderer->attributes.color, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex3d), (GLvoid *)offsetof(Vertex3d, color));
// Normal
glEnableVertexAttribArray(renderer->attributes.normal);
glVertexAttribPointer(renderer->attributes.normal, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex3d), (GLvoid *)offsetof(Vertex3d, normal));
glBindVertexArray(0);
}
void Mesh3d::unload() {
if (vao) glDeleteVertexArrays(1, &vao);
if (vbo) glDeleteBuffers(1, &vbo);
if (ebo) glDeleteBuffers(1, &ebo);
vertices.deallocate();
indices.deallocate();
}
void Mesh3d::render(Renderer3d* renderer) {
setShaderMat4(renderer->uniforms.model, model);
glBindVertexArray(vao);
glDrawElements(GL_TRIANGLES, indices.numElements, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
}
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