mirror of
https://github.com/bjornbytes/lovr.git
synced 2024-07-05 13:53:38 +00:00
559 lines
14 KiB
C
559 lines
14 KiB
C
#include "graphics/graphics.h"
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#include "util.h"
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#include "glfw.h"
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#define _USE_MATH_DEFINES
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#include <stdlib.h>
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#include <math.h>
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#include <assimp/cimport.h>
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#include <assimp/scene.h>
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#include <assimp/postprocess.h>
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static GraphicsState state;
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void lovrGraphicsInit() {
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vec_init(&state.transforms);
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state.projection = mat4_init();
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state.defaultShader = lovrShaderCreate(lovrDefaultVertexShader, lovrDefaultFragmentShader);
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state.skyboxShader = lovrShaderCreate(lovrSkyboxVertexShader, lovrSkyboxFragmentShader);
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glGenBuffers(1, &state.shapeBuffer);
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glGenBuffers(1, &state.shapeIndexBuffer);
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glGenVertexArrays(1, &state.shapeArray);
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vec_init(&state.shapeData);
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vec_init(&state.shapeIndices);
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lovrGraphicsReset();
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}
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void lovrGraphicsDestroy() {
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lovrGraphicsSetShader(NULL);
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glUseProgram(0);
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lovrRelease(&state.defaultShader->ref);
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vec_deinit(&state.transforms);
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mat4_deinit(state.projection);
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lovrRelease(&state.defaultShader->ref);
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lovrRelease(&state.skyboxShader->ref);
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glDeleteBuffers(1, &state.shapeBuffer);
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glDeleteBuffers(1, &state.shapeIndexBuffer);
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glDeleteVertexArrays(1, &state.shapeArray);
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vec_deinit(&state.shapeData);
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vec_deinit(&state.shapeIndices);
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}
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void lovrGraphicsReset() {
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int i;
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mat4 matrix;
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vec_foreach(&state.transforms, matrix, i) {
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mat4_deinit(matrix);
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}
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vec_clear(&state.transforms);
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vec_push(&state.transforms, mat4_init());
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lovrGraphicsSetProjection(.1f, 100.f, 67 * M_PI / 180); // TODO customize via lovr.conf
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lovrGraphicsSetShader(state.defaultShader);
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lovrGraphicsSetBackgroundColor(0, 0, 0, 0);
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lovrGraphicsSetColor(255, 255, 255, 255);
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lovrGraphicsSetColorMask(1, 1, 1, 1);
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lovrGraphicsSetScissorEnabled(0);
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lovrGraphicsSetLineWidth(1);
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lovrGraphicsSetPointSize(1);
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lovrGraphicsSetCullingEnabled(0);
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lovrGraphicsSetPolygonWinding(POLYGON_WINDING_COUNTERCLOCKWISE);
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}
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void lovrGraphicsClear(int color, int depth) {
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int bits = 0;
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if (color) {
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bits |= GL_COLOR_BUFFER_BIT;
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}
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if (depth) {
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bits |= GL_DEPTH_BUFFER_BIT;
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}
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glClear(bits);
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}
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void lovrGraphicsPresent() {
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glfwSwapBuffers(window);
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}
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void lovrGraphicsPrepare() {
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Shader* shader = lovrGraphicsGetShader();
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lovrShaderBind(shader, vec_last(&state.transforms), state.projection, state.color, 0);
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}
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void lovrGraphicsGetBackgroundColor(float* r, float* g, float* b, float* a) {
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GLfloat clearColor[4];
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glGetFloatv(GL_COLOR_CLEAR_VALUE, clearColor);
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*r = clearColor[0];
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*g = clearColor[1];
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*b = clearColor[2];
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*a = clearColor[3];
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}
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void lovrGraphicsSetBackgroundColor(float r, float g, float b, float a) {
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glClearColor(r / 255, g / 255, b / 255, a / 255);
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}
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void lovrGraphicsGetColor(unsigned char* r, unsigned char* g, unsigned char* b, unsigned char* a) {
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*r = LOVR_COLOR_R(state.color);
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*g = LOVR_COLOR_G(state.color);
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*b = LOVR_COLOR_B(state.color);
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*a = LOVR_COLOR_A(state.color);
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}
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void lovrGraphicsSetColor(unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
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state.color = LOVR_COLOR(r, g, b, a);
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}
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void lovrGraphicsGetColorMask(char* r, char* g, char* b, char* a) {
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char mask = state.colorMask;
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*r = mask & 0x1;
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*g = mask & 0x2;
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*b = mask & 0x4;
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*a = mask & 0x8;
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}
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void lovrGraphicsSetColorMask(char r, char g, char b, char a) {
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state.colorMask = ((r & 1) << 0) | ((g & 1) << 1) | ((b & 1) << 2) | ((a & 1) << 3);
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glColorMask(r, g, b, a);
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}
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char lovrGraphicsIsScissorEnabled() {
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return state.isScissorEnabled;
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}
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void lovrGraphicsSetScissorEnabled(char isEnabled) {
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state.isScissorEnabled = isEnabled;
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if (isEnabled) {
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glEnable(GL_SCISSOR_TEST);
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} else {
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glDisable(GL_SCISSOR_TEST);
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}
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}
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void lovrGraphicsGetScissor(int* x, int* y, int* width, int* height) {
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*x = state.scissor.x;
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*y = state.scissor.x;
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*width = state.scissor.width;
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*height = state.scissor.height;
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}
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void lovrGraphicsSetScissor(int x, int y, int width, int height) {
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int windowWidth, windowHeight;
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glfwGetFramebufferSize(window, &windowWidth, &windowHeight);
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state.scissor.x = x;
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state.scissor.x = y;
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state.scissor.width = width;
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state.scissor.height = height;
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glScissor(x, windowHeight - y, width, height);
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}
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Shader* lovrGraphicsGetShader() {
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return state.activeShader;
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}
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void lovrGraphicsSetShader(Shader* shader) {
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if (!shader) {
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shader = state.defaultShader;
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}
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if (shader != state.activeShader) {
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if (state.activeShader) {
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lovrRelease(&state.activeShader->ref);
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}
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state.activeShader = shader;
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lovrRetain(&state.activeShader->ref);
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}
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}
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void lovrGraphicsSetProjection(float near, float far, float fov) {
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int width, height;
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glfwGetWindowSize(window, &width, &height);
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mat4_setProjection(state.projection, near, far, fov, (float) width / height);
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}
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void lovrGraphicsSetProjectionRaw(mat4 projection) {
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memcpy(state.projection, projection, 16 * sizeof(float));
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}
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float lovrGraphicsGetLineWidth() {
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return state.lineWidth;
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}
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void lovrGraphicsSetLineWidth(float width) {
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state.lineWidth = width;
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glLineWidth(width);
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}
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float lovrGraphicsGetPointSize() {
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return state.pointSize;
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}
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void lovrGraphicsSetPointSize(float size) {
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state.pointSize = size;
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glPointSize(size);
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}
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char lovrGraphicsIsCullingEnabled() {
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return state.isCullingEnabled;
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}
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void lovrGraphicsSetCullingEnabled(char isEnabled) {
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state.isCullingEnabled = isEnabled;
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if (isEnabled) {
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glEnable(GL_CULL_FACE);
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} else {
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glDisable(GL_CULL_FACE);
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}
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}
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PolygonWinding lovrGraphicsGetPolygonWinding() {
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return state.polygonWinding;
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}
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void lovrGraphicsSetPolygonWinding(PolygonWinding winding) {
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state.polygonWinding = winding;
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glFrontFace(winding);
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}
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int lovrGraphicsPush() {
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vec_mat4_t* transforms = &state.transforms;
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if (transforms->length >= 64) { return 1; }
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vec_push(transforms, mat4_copy(vec_last(transforms)));
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return 0;
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}
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int lovrGraphicsPop() {
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vec_mat4_t* transforms = &state.transforms;
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if (transforms->length <= 1) { return 1; }
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mat4_deinit(vec_pop(transforms));
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return 0;
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}
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void lovrGraphicsOrigin() {
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vec_mat4_t* transforms = &state.transforms;
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mat4_setIdentity(vec_last(transforms));
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}
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void lovrGraphicsTranslate(float x, float y, float z) {
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mat4_translate(vec_last(&state.transforms), x, y, z);
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}
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void lovrGraphicsRotate(float w, float x, float y, float z) {
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mat4_rotate(vec_last(&state.transforms), w, x, y, z);
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}
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void lovrGraphicsScale(float x, float y, float z) {
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mat4_scale(vec_last(&state.transforms), x, y, z);
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}
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void lovrGraphicsTransform(float tx, float ty, float tz, float sx, float sy, float sz, float angle, float ax, float ay, float az) {
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// Normalize rotation vector
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float len = sqrtf(ax * ax + ay * ay + az * az);
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if (len != 1 && len != 0) {
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len = 1 / len;
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ax *= len;
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ay *= len;
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az *= len;
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}
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// Convert angle-axis to quaternion
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float cos2 = cos(angle / 2.f);
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float sin2 = sin(angle / 2.f);
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float qw = cos2;
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float qx = sin2 * ax;
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float qy = sin2 * ay;
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float qz = sin2 * az;
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// M *= T * S * R
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float transform[16];
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mat4_setTranslation(transform, tx, ty, tz);
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mat4_scale(transform, sx, sy, sz);
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mat4_rotate(transform, qw, qx, qy, qz);
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lovrGraphicsMatrixTransform(transform);
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}
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void lovrGraphicsMatrixTransform(mat4 transform) {
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mat4_multiply(vec_last(&state.transforms), transform);
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}
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int lovrGraphicsGetWidth() {
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int width;
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glfwGetFramebufferSize(window, &width, NULL);
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return width;
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}
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int lovrGraphicsGetHeight() {
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int height;
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glfwGetFramebufferSize(window, NULL, &height);
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return height;
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}
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void lovrGraphicsSetShapeData(float* data, int dataCount, unsigned int* indices, int indicesCount) {
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vec_clear(&state.shapeIndices);
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vec_clear(&state.shapeData);
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if (data) {
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vec_pusharr(&state.shapeData, data, dataCount);
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}
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if (indices) {
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vec_pusharr(&state.shapeIndices, indices, indicesCount);
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}
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}
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void lovrGraphicsDrawLinedShape(GLenum mode) {
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vec_float_t* vertices = &state.shapeData;
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vec_uint_t* indices = &state.shapeIndices;
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lovrGraphicsPrepare();
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glBindVertexArray(state.shapeArray);
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glBindBuffer(GL_ARRAY_BUFFER, state.shapeBuffer);
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glBufferData(GL_ARRAY_BUFFER, vertices->length * sizeof(float), vertices->data, GL_STREAM_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
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if (indices->length > 0) {
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, state.shapeIndexBuffer);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices->length * sizeof(unsigned int), indices->data, GL_STREAM_DRAW);
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glDrawElements(mode, indices->length, GL_UNSIGNED_INT, NULL);
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} else {
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glDrawArrays(mode, 0, vertices->length / 3);
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}
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}
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void lovrGraphicsDrawFilledShape() {
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vec_float_t* vertices = &state.shapeData;
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int stride = 6;
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int strideBytes = stride * sizeof(float);
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lovrGraphicsPrepare();
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glBindVertexArray(state.shapeArray);
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glBindBuffer(GL_ARRAY_BUFFER, state.shapeBuffer);
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glBufferData(GL_ARRAY_BUFFER, vertices->length * sizeof(float), vertices->data, GL_STREAM_DRAW);
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glEnableVertexAttribArray(LOVR_SHADER_POSITION);
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glVertexAttribPointer(LOVR_SHADER_POSITION, 3, GL_FLOAT, GL_FALSE, strideBytes, (void*) 0);
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glEnableVertexAttribArray(LOVR_SHADER_NORMAL);
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glVertexAttribPointer(LOVR_SHADER_NORMAL, 3, GL_FLOAT, GL_FALSE, strideBytes, (void*) (3 * sizeof(float)));
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glDrawArrays(GL_TRIANGLE_STRIP, 0, vertices->length / stride);
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glBindVertexArray(0);
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}
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void lovrGraphicsPoints(float* points, int count) {
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lovrGraphicsSetShapeData(points, count, NULL, 0);
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lovrGraphicsDrawLinedShape(GL_POINTS);
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}
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void lovrGraphicsLine(float* points, int count) {
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lovrGraphicsSetShapeData(points, count, NULL, 0);
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lovrGraphicsDrawLinedShape(GL_LINE_STRIP);
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}
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void lovrGraphicsPlane(DrawMode mode, float x, float y, float z, float size, float nx, float ny, float nz) {
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// Normalize the normal vector
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float len = sqrt(nx * nx + ny * ny + nz + nz);
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if (len != 1) {
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len = 1 / len;
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nx *= len;
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ny *= len;
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nz *= len;
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}
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// Vector perpendicular to the normal vector and the vector of the default geometry (cross product)
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float cx = -ny;
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float cy = nx;
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float cz = 0.f;
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// Angle between normal vector and the normal vector of the default geometry (dot product)
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float theta = acos(nz);
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lovrGraphicsPush();
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lovrGraphicsTransform(x, y, z, size, size, size, theta, cx, cy, cz);
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if (mode == DRAW_MODE_LINE) {
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float points[] = {
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-.5, .5, 0,
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.5, .5, 0,
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.5, -.5, 0,
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-.5, -.5, 0
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};
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lovrGraphicsSetShapeData(points, 12, NULL, 0);
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lovrGraphicsDrawLinedShape(GL_LINE_LOOP);
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} else if (mode == DRAW_MODE_FILL) {
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float data[] = {
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-.5, .5, 0, 0, 0, -1,
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-.5, -.5, 0, 0, 0, -1,
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.5, .5, 0, 0, 0, -1,
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.5, -.5, 0, 0, 0, -1
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};
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lovrGraphicsSetShapeData(data, 24, NULL, 0);
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lovrGraphicsDrawFilledShape();
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}
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lovrGraphicsPop();
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}
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void lovrGraphicsCube(DrawMode mode, float x, float y, float z, float size, float angle, float axisX, float axisY, float axisZ) {
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lovrGraphicsPush();
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lovrGraphicsTransform(x, y, z, size, size, size, angle, axisX, axisY, axisZ);
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if (mode == DRAW_MODE_LINE) {
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float points[] = {
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// Front
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-.5, .5, -.5,
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.5, .5, -.5,
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.5, -.5, -.5,
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-.5, -.5, -.5,
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// Back
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-.5, .5, .5,
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.5, .5, .5,
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.5, -.5, .5,
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-.5, -.5, .5
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};
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unsigned int indices[] = {
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0, 1, 1, 2, 2, 3, 3, 0, // Front
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4, 5, 5, 6, 6, 7, 7, 4, // Back
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0, 4, 1, 5, 2, 6, 3, 7 // Connections
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};
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lovrGraphicsSetShapeData(points, 24, indices, 24);
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lovrGraphicsDrawLinedShape(GL_LINES);
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} else {
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float data[] = {
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// Front
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-.5, -.5, -.5, 0, 0, -1,
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.5, -.5, -.5, 0, 0, -1,
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-.5, .5, -.5, 0, 0, -1,
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.5, .5, -.5, 0, 0, -1,
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// Right
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.5, .5, -.5, 1, 0, 0,
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.5, -.5, -.5, 1, 0, 0,
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.5, .5, .5, 1, 0, 0,
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.5, -.5, .5, 1, 0, 0,
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// Back
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.5, -.5, .5, 0, 0, 1,
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-.5, -.5, .5, 0, 0, 1,
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.5, .5, .5, 0, 0, 1,
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-.5, .5, .5, 0, 0, 1,
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// Left
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-.5, .5, .5, -1, 0, 0,
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-.5, -.5, .5, -1, 0, 0,
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-.5, .5, -.5, -1, 0, 0,
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-.5, -.5, -.5, -1, 0, 0,
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// Bottom
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-.5, -.5, -.5, 0, -1, 0,
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-.5, -.5, .5, 0, -1, 0,
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.5, -.5, -.5, 0, -1, 0,
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.5, -.5, .5, 0, -1, 0,
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// Adjust
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.5, -.5, .5, 0, 1, 0,
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-.5, .5, -.5, 0, 1, 0,
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// Top
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-.5, .5, -.5, 0, 1, 0,
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.5, .5, -.5, 0, 1, 0,
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-.5, .5, .5, 0, 1, 0,
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.5, .5, .5, 0, 1, 0
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};
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lovrGraphicsSetShapeData(data, 156, NULL, 0);
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lovrGraphicsDrawFilledShape();
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}
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lovrGraphicsPop();
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}
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void lovrGraphicsSkybox(Skybox* skybox, float angle, float ax, float ay, float az) {
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if (!skybox) {
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return;
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}
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Shader* lastShader = lovrGraphicsGetShader();
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lovrRetain(&lastShader->ref);
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lovrGraphicsSetShader(state.skyboxShader);
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float cos2 = cos(angle / 2);
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float sin2 = sin(angle / 2);
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float rw = cos2;
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float rx = sin2 * ax;
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float ry = sin2 * ay;
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float rz = sin2 * az;
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lovrGraphicsPrepare();
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lovrGraphicsPush();
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lovrGraphicsOrigin();
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lovrGraphicsRotate(rw, rx, ry, rz);
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float cube[] = {
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// Front
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1.f, -1.f, -1.f, 0, 0, 0,
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1.f, 1.f, -1.f, 0, 0, 0,
|
|
-1.f, -1.f, -1.f, 0, 0, 0,
|
|
-1.f, 1.f, -1.f, 0, 0, 0,
|
|
|
|
// Left
|
|
-1.f, 1.f, -1.f, 0, 0, 0,
|
|
-1.f, 1.f, 1.f, 0, 0, 0,
|
|
-1.f, -1.f, -1.f, 0, 0, 0,
|
|
-1.f, -1.f, 1.f, 0, 0, 0,
|
|
|
|
// Back
|
|
-1.f, -1.f, 1.f, 0, 0, 0,
|
|
1.f, -1.f, 1.f, 0, 0, 0,
|
|
-1.f, 1.f, 1.f, 0, 0, 0,
|
|
1.f, 1.f, 1.f, 0, 0, 0,
|
|
|
|
// Right
|
|
1.f, 1.f, 1.f, 0, 0, 0,
|
|
1.f, -1.f, 1.f, 0, 0, 0,
|
|
1.f, 1.f, -1.f, 0, 0, 0,
|
|
1.f, -1.f, -1.f, 0, 0, 0,
|
|
|
|
// Bottom
|
|
1.f, -1.f, -1.f, 0, 0, 0,
|
|
1.f, -1.f, 1.f, 0, 0, 0,
|
|
-1.f, -1.f, -1.f, 0, 0, 0,
|
|
-1.f, -1.f, 1.f, 0, 0, 0,
|
|
|
|
// Adjust
|
|
-1.f, -1.f, 1.f, 0, 0, 0,
|
|
-1.f, 1.f, -1.f, 0, 0, 0,
|
|
|
|
// Top
|
|
-1.f, 1.f, -1.f, 0, 0, 0,
|
|
-1.f, 1.f, 1.f, 0, 0, 0,
|
|
1.f, 1.f, -1.f, 0, 0, 0,
|
|
1.f, 1.f, 1.f, 0, 0, 0
|
|
};
|
|
|
|
glDepthMask(GL_FALSE);
|
|
glActiveTexture(GL_TEXTURE0);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, skybox->texture);
|
|
|
|
lovrGraphicsSetShapeData(cube, 156, NULL, 0);
|
|
lovrGraphicsDrawFilledShape();
|
|
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
|
|
glDepthMask(GL_TRUE);
|
|
|
|
lovrGraphicsSetShader(lastShader);
|
|
lovrRelease(&lastShader->ref);
|
|
lovrGraphicsPop();
|
|
}
|