(WIP) Getting started in 3d land

5 files changed, 182 insertions, 1 deletions

diff --git a/shared_cpp/Camera3d.h b/shared_cpp/Camera3d.h
new file mode 100644
index 0000000..7186975
--- /dev/null
+++ b/shared_cpp/Camera3d.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include "mathlib.h"
+
+struct Camera3d {
+	Mat4x4 projection;
+	Mat4x4 view;
+};
diff --git a/shared_cpp/Renderer3d.cpp b/shared_cpp/Renderer3d.cpp
new file mode 100644
index 0000000..7afaea0
--- /dev/null
+++ b/shared_cpp/Renderer3d.cpp
@@ -0,0 +1,104 @@
+#include "Renderer3d.h"
+#include "Camera3d.h"
+#include "WebglContext.h"
+
+const char* vertexSrc =
+	"attribute vec3 position;\n"
+	"attribute vec3 normal;\n"
+	"attribute vec4 color;\n"
+	"uniform mat4 projection;\n"
+	"uniform mat4 view;\n"
+	"uniform mat4 model;\n"
+	"varying lowp vec4 VertexColor;\n"
+	"varying lowp vec3 VertexNormal;\n"
+	"void main() { \n"
+	"    vec4 fragmentPosition = projection * view * model * vec4(position, 1);"
+	"    gl_Position = fragmentPosition;\n"
+	"    VertexColor = color;\n"
+	"    VertexNormal = normal;\n"
+	"}\n";
+
+const char* fragmentSrc = 
+	"varying lowp vec4 VertexColor; \n"
+	"varying lowp vec3 VertexNormal; \n"
+	"void main() { \n"
+	"    gl_FragColor = VertexColor; \n"
+	"}";
+
+
+void Renderer3d::load(WebglContext* context) {
+	printf("Compiling 3d shader...\n");
+
+	shader = loadShader(vertexSrc, fragmentSrc);
+
+	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");
+
+	printf("3d shader compiled.\n");
+}
+
+void Renderer3d::render(Camera3d* camera) {
+	glEnable(GL_DEPTH_TEST);
+	glDepthFunc(GL_LEQUAL);
+	glDepthMask(GL_TRUE);
+	glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+	glClearDepth(1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+	useShader(shader);
+	setShaderMat4(uniforms.projection, camera->projection);
+	setShaderMat4(uniforms.view, camera->view);
+}
+
+void Renderer3d::unload() {
+	glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT);
+	glDeleteProgram(shader);
+}
+
+void Mesh3d::load(Vertex3d* inVertices, uint32 inNumVertices, uint32* inIndices, uint32 inNumIndices, Renderer3d* renderer) {
+	numIndices = inNumIndices;
+	useShader(renderer->shader);
+
+	glGenVertexArrays(1, &vao);
+	glBindVertexArray(vao);
+
+	glGenBuffers(1, &vbo);
+	glGenBuffers(1, &ebo);
+	
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, inNumVertices * sizeof(Vertex3d), &inVertices[0], GL_STATIC_DRAW);
+
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, inNumIndices * sizeof(uint32), &inIndices[0], GL_STATIC_DRAW);
+
+	glEnableVertexAttribArray(renderer->attributes.position);
+	glVertexAttribPointer(renderer->attributes.position, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex3d), (GLvoid *)0);
+
+	glEnableVertexAttribArray(renderer->attributes.normal);
+	glVertexAttribPointer(renderer->attributes.normal, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex3d), (GLvoid *)offsetof(Vertex3d, normal));
+
+	glEnableVertexAttribArray(renderer->attributes.color);
+	glVertexAttribPointer(renderer->attributes.color, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex3d), (GLvoid *)offsetof(Vertex3d, color));
+
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+}
+
+void Mesh3d::render(Renderer3d* renderer, GLenum drawType) {
+	setShaderMat4(renderer->uniforms.model, model);
+
+	glBindVertexArray(vao);
+	glDrawElements(drawType, numIndices, GL_UNSIGNED_INT, 0);
+	glBindVertexArray(0);
+}
+
+void Mesh3d::unload() {
+	glDeleteVertexArrays(1, &vao);
+	glDeleteBuffers(1, &vbo);
+}
diff --git a/shared_cpp/Renderer3d.h b/shared_cpp/Renderer3d.h
new file mode 100644
index 0000000..64288ad
--- /dev/null
+++ b/shared_cpp/Renderer3d.h
@@ -0,0 +1,47 @@
+#pragma once
+
+#include "types.h"
+#include "Shader.h"
+#include "mathlib.h"
+
+struct Camera3d;
+struct WebglContext;
+
+struct Renderer3d {
+    uint32 shader;
+
+	struct {
+	    int32 position;
+		int32 color;
+		int32 normal;
+	} attributes;
+
+	struct {
+		int32 projection;
+		int32 view;
+		int32 model;
+	} uniforms;
+
+	void load(WebglContext* context);
+	void render(Camera3d* camera);
+	void unload();
+};
+
+struct Vertex3d {
+	Vector3 position;
+	Vector3 normal;
+	Vector4 color;
+};
+
+struct Mesh3d {
+	uint32 vao;
+	uint32 vbo;
+	uint32 ebo;
+	uint32 numIndices = 0;
+
+	Mat4x4 model;
+
+	void load(Vertex3d* vertices, uint32 numVertices, uint32* indices, uint32 numIndices, Renderer3d* renderer);
+	void render(Renderer3d* renderer, GLenum drawType = GL_TRIANGLES);
+	void unload();
+};
diff --git a/shared_cpp/Shader.h b/shared_cpp/Shader.h
index 6ee9981..bc81764 100644
--- a/shared_cpp/Shader.h
+++ b/shared_cpp/Shader.h
@@ -21,6 +21,7 @@ inline GLint getShaderAttribute(const Shader& shader, const GLchar *name) {
 	printf("Getting attribute for shader, name: %d, %s\n", shader, name);
     GLint uid = glGetAttribLocation(shader, name);
 	if (uid < 0) {
+		printf("Unable to get attribute %s for shader %d\n", name, shader);
 		return -1;
 	}
 	return uid;
@@ -60,4 +61,4 @@ inline void setShaderBVec4(GLint location, bool first, bool second, bool third,
 
 inline void setShaderBool(GLint location, bool value) {
 	glUniform1i(location, value);
-}
\ No newline at end of file
+}
diff --git a/shared_cpp/mathlib.h b/shared_cpp/mathlib.h
index 3ed61cd..ec0ae87 100644
--- a/shared_cpp/mathlib.h
+++ b/shared_cpp/mathlib.h
@@ -87,6 +87,10 @@ struct Vector3 {
     float x = 0.f;
     float y = 0.f;
     float z = 0.f;
+
+    float length() {
+		return sqrtf(x * x + y * y + z * z);
+	}
 };
 
 struct Vector4 {
@@ -217,6 +221,21 @@ struct Mat4x4 {
         return inv;
     }
 
+	Mat4x4 getPerspectiveProjection(float near, float far, float fieldOfViewRadians, float aspectRatio) {
+		float halfFieldOfView = fieldOfViewRadians * 0.5f;
+		float top = tan(halfFieldOfView) * near;
+		float bottom = -top;
+		float right = top * aspectRatio;
+		float left = -right;
+
+		return {
+			{ (2 * near) / (right - left), 0, 0, 0,
+			  0, (2 * near) / (top - bottom), 0, 0,
+			  (right + left) / (right - left), (top + bottom) / (top - bottom), -(far + near) / (far - near), -1,
+			  0, 0, (-2 * far * near) / (far - near), 0 }
+		};
+	}
+
 	void print() {
 		printf("[ ");
 		for (int idx = 0; idx < 16; idx++) {
@@ -225,3 +244,5 @@ struct Mat4x4 {
 		printf(" ]\n");
 	}
 };
+
+