565 lines
18 KiB
C
565 lines
18 KiB
C
#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <limits.h>
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#include <dc/vec3f.h>
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#include "private.h"
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#define _MIN(x, y) (x < y) ? x : y
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/* Lighting will not be calculated if the attenuation
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* multiplier ends up less than this value */
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#define ATTENUATION_THRESHOLD 0.01f
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static GLfloat SCENE_AMBIENT [] = {0.2f, 0.2f, 0.2f, 1.0f};
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static GLboolean VIEWER_IN_EYE_COORDINATES = GL_TRUE;
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static GLenum COLOR_CONTROL = GL_SINGLE_COLOR;
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static GLenum COLOR_MATERIAL_MODE = GL_AMBIENT_AND_DIFFUSE;
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#define AMBIENT_MASK 1
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#define DIFFUSE_MASK 2
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#define EMISSION_MASK 4
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#define SPECULAR_MASK 8
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#define SCENE_AMBIENT_MASK 16
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static GLenum COLOR_MATERIAL_MASK = AMBIENT_MASK | DIFFUSE_MASK;
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static LightSource LIGHTS[MAX_LIGHTS];
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static Material MATERIAL;
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GL_FORCE_INLINE void _glPrecalcLightingValues(GLuint mask);
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void _glInitLights() {
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static GLfloat ONE [] = {1.0f, 1.0f, 1.0f, 1.0f};
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static GLfloat ZERO [] = {0.0f, 0.0f, 0.0f, 1.0f};
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static GLfloat PARTIAL [] = {0.2f, 0.2f, 0.2f, 1.0f};
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static GLfloat MOSTLY [] = {0.8f, 0.8f, 0.8f, 1.0f};
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memcpy(MATERIAL.ambient, PARTIAL, sizeof(GLfloat) * 4);
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memcpy(MATERIAL.diffuse, MOSTLY, sizeof(GLfloat) * 4);
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memcpy(MATERIAL.specular, ZERO, sizeof(GLfloat) * 4);
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memcpy(MATERIAL.emissive, ZERO, sizeof(GLfloat) * 4);
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MATERIAL.exponent = 0.0f;
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GLubyte i;
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for(i = 0; i < MAX_LIGHTS; ++i) {
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memcpy(LIGHTS[i].ambient, ZERO, sizeof(GLfloat) * 4);
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memcpy(LIGHTS[i].diffuse, ONE, sizeof(GLfloat) * 4);
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memcpy(LIGHTS[i].specular, ONE, sizeof(GLfloat) * 4);
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if(i > 0) {
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memcpy(LIGHTS[i].diffuse, ZERO, sizeof(GLfloat) * 4);
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memcpy(LIGHTS[i].specular, ZERO, sizeof(GLfloat) * 4);
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}
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LIGHTS[i].position[0] = LIGHTS[i].position[1] = LIGHTS[i].position[3] = 0.0f;
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LIGHTS[i].position[2] = 1.0f;
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LIGHTS[i].isDirectional = GL_TRUE;
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LIGHTS[i].isEnabled = GL_FALSE;
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LIGHTS[i].spot_direction[0] = LIGHTS[i].spot_direction[1] = 0.0f;
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LIGHTS[i].spot_direction[2] = -1.0f;
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LIGHTS[i].spot_exponent = 0.0f;
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LIGHTS[i].spot_cutoff = 180.0f;
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LIGHTS[i].constant_attenuation = 1.0f;
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LIGHTS[i].linear_attenuation = 0.0f;
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LIGHTS[i].quadratic_attenuation = 0.0f;
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}
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_glPrecalcLightingValues(~0);
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}
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void _glEnableLight(GLubyte light, GLboolean value) {
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LIGHTS[light].isEnabled = value;
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}
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GL_FORCE_INLINE void _glPrecalcLightingValues(GLuint mask) {
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float baseColour[4];
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/* Pre-calculate lighting values */
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GLubyte i;
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for(i = 0; i < MAX_LIGHTS; ++i) {
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if(mask & AMBIENT_MASK) {
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LIGHTS[i].ambientMaterial[0] = LIGHTS[i].ambient[0] * MATERIAL.ambient[0];
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LIGHTS[i].ambientMaterial[1] = LIGHTS[i].ambient[1] * MATERIAL.ambient[1];
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LIGHTS[i].ambientMaterial[2] = LIGHTS[i].ambient[2] * MATERIAL.ambient[2];
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LIGHTS[i].ambientMaterial[3] = LIGHTS[i].ambient[3] * MATERIAL.ambient[3];
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}
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if(mask & DIFFUSE_MASK) {
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LIGHTS[i].diffuseMaterial[0] = LIGHTS[i].diffuse[0] * MATERIAL.diffuse[0];
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LIGHTS[i].diffuseMaterial[1] = LIGHTS[i].diffuse[1] * MATERIAL.diffuse[1];
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LIGHTS[i].diffuseMaterial[2] = LIGHTS[i].diffuse[2] * MATERIAL.diffuse[2];
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LIGHTS[i].diffuseMaterial[3] = LIGHTS[i].diffuse[3] * MATERIAL.diffuse[3];
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}
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if(mask & SPECULAR_MASK) {
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LIGHTS[i].specularMaterial[0] = LIGHTS[i].specular[0] * MATERIAL.specular[0];
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LIGHTS[i].specularMaterial[1] = LIGHTS[i].specular[1] * MATERIAL.specular[1];
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LIGHTS[i].specularMaterial[2] = LIGHTS[i].specular[2] * MATERIAL.specular[2];
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LIGHTS[i].specularMaterial[3] = LIGHTS[i].specular[3] * MATERIAL.specular[3];
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}
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}
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/* If ambient or emission are updated, we need to update
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* the base colour. */
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if((mask & AMBIENT_MASK) || (mask & EMISSION_MASK) || (mask & SCENE_AMBIENT_MASK)) {
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baseColour[0] = MATH_fmac(SCENE_AMBIENT[0], MATERIAL.ambient[0], MATERIAL.emissive[0]);
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baseColour[1] = MATH_fmac(SCENE_AMBIENT[1], MATERIAL.ambient[1], MATERIAL.emissive[1]);
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baseColour[2] = MATH_fmac(SCENE_AMBIENT[2], MATERIAL.ambient[2], MATERIAL.emissive[2]);
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baseColour[3] = MATH_fmac(SCENE_AMBIENT[3], MATERIAL.ambient[3], MATERIAL.emissive[3]);
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MATERIAL.baseColour[R8IDX] = (uint8_t)(_MIN(baseColour[0] * 255.0f, 255.0f));
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MATERIAL.baseColour[G8IDX] = (uint8_t)(_MIN(baseColour[1] * 255.0f, 255.0f));
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MATERIAL.baseColour[B8IDX] = (uint8_t)(_MIN(baseColour[2] * 255.0f, 255.0f));
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MATERIAL.baseColour[A8IDX] = (uint8_t)(_MIN(baseColour[3] * 255.0f, 255.0f));
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}
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}
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void APIENTRY glLightModelf(GLenum pname, const GLfloat param) {
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glLightModelfv(pname, ¶m);
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}
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void APIENTRY glLightModeli(GLenum pname, const GLint param) {
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glLightModeliv(pname, ¶m);
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}
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void APIENTRY glLightModelfv(GLenum pname, const GLfloat *params) {
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switch(pname) {
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case GL_LIGHT_MODEL_AMBIENT: {
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memcpy(SCENE_AMBIENT, params, sizeof(GLfloat) * 4);
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_glPrecalcLightingValues(SCENE_AMBIENT_MASK);
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} break;
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case GL_LIGHT_MODEL_LOCAL_VIEWER:
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VIEWER_IN_EYE_COORDINATES = (*params) ? GL_TRUE : GL_FALSE;
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break;
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case GL_LIGHT_MODEL_TWO_SIDE:
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/* Not implemented */
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default:
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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}
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}
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void APIENTRY glLightModeliv(GLenum pname, const GLint* params) {
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switch(pname) {
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case GL_LIGHT_MODEL_COLOR_CONTROL:
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COLOR_CONTROL = *params;
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break;
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case GL_LIGHT_MODEL_LOCAL_VIEWER:
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VIEWER_IN_EYE_COORDINATES = (*params) ? GL_TRUE : GL_FALSE;
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break;
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default:
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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}
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}
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void APIENTRY glLightfv(GLenum light, GLenum pname, const GLfloat *params) {
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GLubyte idx = light & 0xF;
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if(idx >= MAX_LIGHTS) {
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return;
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}
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GLuint mask = (pname == GL_AMBIENT) ? AMBIENT_MASK :
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(pname == GL_DIFFUSE) ? DIFFUSE_MASK :
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(pname == GL_SPECULAR) ? SPECULAR_MASK : 0;
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switch(pname) {
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case GL_AMBIENT:
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memcpy(LIGHTS[idx].ambient, params, sizeof(GLfloat) * 4);
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break;
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case GL_DIFFUSE:
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memcpy(LIGHTS[idx].diffuse, params, sizeof(GLfloat) * 4);
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break;
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case GL_SPECULAR:
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memcpy(LIGHTS[idx].specular, params, sizeof(GLfloat) * 4);
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break;
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case GL_POSITION: {
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_glMatrixLoadModelView();
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memcpy(LIGHTS[idx].position, params, sizeof(GLfloat) * 4);
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LIGHTS[idx].isDirectional = params[3] == 0.0f;
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if(LIGHTS[idx].isDirectional) {
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//FIXME: Do we need to rotate directional lights?
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} else {
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mat_trans_single4(
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LIGHTS[idx].position[0],
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LIGHTS[idx].position[1],
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LIGHTS[idx].position[2],
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LIGHTS[idx].position[3]
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);
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}
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}
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break;
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case GL_SPOT_DIRECTION: {
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LIGHTS[idx].spot_direction[0] = params[0];
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LIGHTS[idx].spot_direction[1] = params[1];
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LIGHTS[idx].spot_direction[2] = params[2];
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} break;
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case GL_CONSTANT_ATTENUATION:
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case GL_LINEAR_ATTENUATION:
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case GL_QUADRATIC_ATTENUATION:
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case GL_SPOT_CUTOFF:
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case GL_SPOT_EXPONENT:
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glLightf(light, pname, *params);
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break;
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default:
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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}
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_glPrecalcLightingValues(mask);
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}
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void APIENTRY glLightf(GLenum light, GLenum pname, GLfloat param) {
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GLubyte idx = light & 0xF;
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if(idx >= MAX_LIGHTS) {
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return;
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}
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switch(pname) {
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case GL_CONSTANT_ATTENUATION:
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LIGHTS[idx].constant_attenuation = param;
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break;
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case GL_LINEAR_ATTENUATION:
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LIGHTS[idx].linear_attenuation = param;
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break;
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case GL_QUADRATIC_ATTENUATION:
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LIGHTS[idx].quadratic_attenuation = param;
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break;
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case GL_SPOT_EXPONENT:
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LIGHTS[idx].spot_exponent = param;
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break;
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case GL_SPOT_CUTOFF:
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LIGHTS[idx].spot_cutoff = param;
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break;
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default:
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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}
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}
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void APIENTRY glMaterialf(GLenum face, GLenum pname, const GLfloat param) {
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if(face == GL_BACK || pname != GL_SHININESS) {
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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return;
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}
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MATERIAL.exponent = _MIN(param, 128); /* 128 is the max according to the GL spec */
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}
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void APIENTRY glMateriali(GLenum face, GLenum pname, const GLint param) {
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glMaterialf(face, pname, param);
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}
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void APIENTRY glMaterialfv(GLenum face, GLenum pname, const GLfloat *params) {
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if(face == GL_BACK) {
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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return;
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}
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switch(pname) {
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case GL_SHININESS:
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glMaterialf(face, pname, *params);
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break;
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case GL_AMBIENT:
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vec4cpy(MATERIAL.ambient, params);
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break;
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case GL_DIFFUSE:
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vec4cpy(MATERIAL.diffuse, params);
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break;
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case GL_SPECULAR:
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vec4cpy(MATERIAL.specular, params);
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break;
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case GL_EMISSION:
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vec4cpy(MATERIAL.emissive, params);
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break;
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case GL_AMBIENT_AND_DIFFUSE: {
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vec4cpy(MATERIAL.ambient, params);
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vec4cpy(MATERIAL.diffuse, params);
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} break;
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case GL_COLOR_INDEXES:
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default: {
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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}
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}
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GLuint updateMask = (pname == GL_AMBIENT) ? AMBIENT_MASK:
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(pname == GL_DIFFUSE) ? DIFFUSE_MASK:
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(pname == GL_SPECULAR) ? SPECULAR_MASK:
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(pname == GL_EMISSION) ? EMISSION_MASK:
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(pname == GL_AMBIENT_AND_DIFFUSE) ? AMBIENT_MASK | DIFFUSE_MASK : 0;
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_glPrecalcLightingValues(updateMask);
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}
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void APIENTRY glColorMaterial(GLenum face, GLenum mode) {
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if(face != GL_FRONT_AND_BACK) {
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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return;
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}
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GLint validModes[] = {GL_AMBIENT, GL_DIFFUSE, GL_AMBIENT_AND_DIFFUSE, GL_EMISSION, GL_SPECULAR, 0};
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if(_glCheckValidEnum(mode, validModes, __func__) != 0) {
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return;
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}
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COLOR_MATERIAL_MASK = (mode == GL_AMBIENT) ? AMBIENT_MASK:
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(mode == GL_DIFFUSE) ? DIFFUSE_MASK:
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(mode == GL_AMBIENT_AND_DIFFUSE) ? AMBIENT_MASK | DIFFUSE_MASK:
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(mode == GL_EMISSION) ? EMISSION_MASK : SPECULAR_MASK;
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COLOR_MATERIAL_MODE = mode;
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}
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void _glUpdateColourMaterial(GLfloat* colour) {
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if(!_glIsColorMaterialEnabled()) {
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return;
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}
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switch(COLOR_MATERIAL_MODE) {
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case GL_AMBIENT:
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vec4cpy(MATERIAL.ambient, colour);
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break;
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case GL_DIFFUSE:
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vec4cpy(MATERIAL.diffuse, colour);
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break;
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case GL_EMISSION:
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vec4cpy(MATERIAL.emissive, colour);
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break;
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case GL_AMBIENT_AND_DIFFUSE:
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default: {
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vec4cpy(MATERIAL.ambient, colour);
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vec4cpy(MATERIAL.diffuse, colour);
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}
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}
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_glPrecalcLightingValues(COLOR_MATERIAL_MASK);
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}
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GL_FORCE_INLINE GLboolean isDiffuseColorMaterial() {
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return (COLOR_MATERIAL_MODE == GL_DIFFUSE || COLOR_MATERIAL_MODE == GL_AMBIENT_AND_DIFFUSE);
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}
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GL_FORCE_INLINE GLboolean isAmbientColorMaterial() {
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return (COLOR_MATERIAL_MODE == GL_AMBIENT || COLOR_MATERIAL_MODE == GL_AMBIENT_AND_DIFFUSE);
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}
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GL_FORCE_INLINE GLboolean isSpecularColorMaterial() {
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return (COLOR_MATERIAL_MODE == GL_SPECULAR);
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}
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GL_FORCE_INLINE void initVec3(struct vec3f* v, const GLfloat* src) {
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memcpy(v, src, sizeof(GLfloat) * 3);
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}
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/*
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* Implementation from here (MIT):
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* https://github.com/appleseedhq/appleseed/blob/master/src/appleseed/foundation/math/fastmath.h
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*/
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GL_FORCE_INLINE float faster_pow2(const float p) {
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// Underflow of exponential is common practice in numerical routines, so handle it here.
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const float clipp = p < -126.0f ? -126.0f : p;
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const union { uint32_t i; float f; } v =
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{
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(uint32_t) ((1 << 23) * (clipp + 126.94269504f))
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};
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return v.f;
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}
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GL_FORCE_INLINE float faster_log2(const float x) {
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assert(x >= 0.0f);
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const union { float f; uint32_t i; } vx = { x };
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const float y = (float) (vx.i) * 1.1920928955078125e-7f;
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return y - 126.94269504f;
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}
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GL_FORCE_INLINE float faster_pow(const float x, const float p) {
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return faster_pow2(p * faster_log2(x));
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}
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GL_FORCE_INLINE void _glLightVertexDirectional(
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uint8_t* final, uint8_t lid,
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float LdotN, float NdotH) {
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float FI = (MATERIAL.exponent) ?
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faster_pow((LdotN != 0.0f) * NdotH, MATERIAL.exponent) : 1.0f;
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#define _PROCESS_COMPONENT(T, X) \
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do { \
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float F = MATH_fmac(LdotN, LIGHTS[lid].diffuseMaterial[X], LIGHTS[lid].ambientMaterial[X]); \
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F += (FI * LIGHTS[lid].specularMaterial[X]); \
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uint8_t FO = (uint8_t) (_MIN(F * 255.0f, 255.0f)); \
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final[T] += _MIN(FO, 255 - final[T]); \
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} while(0);
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_PROCESS_COMPONENT(R8IDX, 0);
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_PROCESS_COMPONENT(G8IDX, 1);
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_PROCESS_COMPONENT(B8IDX, 2);
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#undef _PROCESS_COMPONENT
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}
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GL_FORCE_INLINE void _glLightVertexPoint(
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uint8_t* final, uint8_t lid,
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float LdotN, float NdotH, float att) {
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float FI = (MATERIAL.exponent) ?
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faster_pow((LdotN != 0.0f) * NdotH, MATERIAL.exponent) : 1.0f;
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#define _PROCESS_COMPONENT(T, X) \
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do { \
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float F = MATH_fmac(LdotN, LIGHTS[lid].diffuseMaterial[X], LIGHTS[lid].ambientMaterial[X]); \
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F += (FI * LIGHTS[lid].specularMaterial[X]); \
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uint8_t FO = (uint8_t) (_MIN(F * att * 255.0f, 255.0f)); \
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final[T] += _MIN(FO, 255 - final[T]); \
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} while(0); \
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_PROCESS_COMPONENT(R8IDX, 0);
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_PROCESS_COMPONENT(G8IDX, 1);
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_PROCESS_COMPONENT(B8IDX, 2);
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#undef _PROCESS_COMPONENT
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}
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GL_FORCE_INLINE void bgra_to_float(const uint8_t* input, GLfloat* output) {
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static const float scale = 1.0f / 255.0f;
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output[0] = ((float) input[R8IDX]) * scale;
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output[1] = ((float) input[G8IDX]) * scale;
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|
output[2] = ((float) input[B8IDX]) * scale;
|
|
output[3] = ((float) input[A8IDX]) * scale;
|
|
}
|
|
|
|
void _glPerformLighting(Vertex* vertices, const EyeSpaceData* es, const int32_t count) {
|
|
uint8_t i;
|
|
int32_t j;
|
|
|
|
Vertex* vertex = vertices;
|
|
const EyeSpaceData* data = es;
|
|
|
|
/* This is the original vertex colour, before we replace it. It's
|
|
* used for colour material */
|
|
float vdiffuse[4];
|
|
|
|
for(j = 0; j < count; ++j, ++vertex, ++data) {
|
|
__builtin_prefetch(vertex + 1, 1, 1);
|
|
__builtin_prefetch(data + 1, 0, 1);
|
|
|
|
/* Unpack the colour for use in glColorMaterial */
|
|
bgra_to_float(vertex->bgra, vdiffuse);
|
|
_glUpdateColourMaterial(vdiffuse);
|
|
|
|
/* Copy the base colour across */
|
|
argbcpy(vertex->bgra, MATERIAL.baseColour);
|
|
|
|
/* Direction to vertex in eye space */
|
|
float Vx = -data->xyz[0];
|
|
float Vy = -data->xyz[1];
|
|
float Vz = -data->xyz[2];
|
|
vec3f_normalize(Vx, Vy, Vz);
|
|
|
|
const float Nx = data->n[0];
|
|
const float Ny = data->n[1];
|
|
const float Nz = data->n[2];
|
|
|
|
for(i = 0; i < MAX_LIGHTS; ++i) {
|
|
__builtin_prefetch(LIGHTS + i + 1, 0, 1);
|
|
|
|
if(!LIGHTS[i].isEnabled) continue;
|
|
|
|
if(LIGHTS[i].isDirectional) {
|
|
float Lx = LIGHTS[i].position[0] - data->xyz[0];
|
|
float Ly = LIGHTS[i].position[1] - data->xyz[1];
|
|
float Lz = LIGHTS[i].position[2] - data->xyz[2];
|
|
|
|
float Hx = (Lx + 0);
|
|
float Hy = (Ly + 0);
|
|
float Hz = (Lz + 1);
|
|
|
|
vec3f_normalize(Lx, Ly, Lz);
|
|
vec3f_normalize(Hx, Hy, Hz);
|
|
|
|
float LdotN = MATH_fipr(
|
|
Nx, Ny, Nz, 1.0f,
|
|
Lx, Ly, Lz, 1.0f
|
|
);
|
|
|
|
float NdotH = MATH_fipr(
|
|
Nx, Ny, Nz, 1.0f,
|
|
Hx, Hy, Hz, 1.0f
|
|
);
|
|
|
|
if(LdotN < 0.0f) LdotN = 0.0f;
|
|
if(NdotH < 0.0f) NdotH = 0.0f;
|
|
|
|
_glLightVertexDirectional(
|
|
vertex->bgra,
|
|
i, LdotN, NdotH
|
|
);
|
|
} else {
|
|
float Lx = LIGHTS[i].position[0] - data->xyz[0];
|
|
float Ly = LIGHTS[i].position[1] - data->xyz[1];
|
|
float Lz = LIGHTS[i].position[2] - data->xyz[2];
|
|
float D;
|
|
|
|
vec3f_length(Lx, Ly, Lz, D);
|
|
|
|
float att = (
|
|
LIGHTS[i].constant_attenuation + (
|
|
LIGHTS[i].linear_attenuation * D
|
|
) + (LIGHTS[i].quadratic_attenuation * D * D)
|
|
);
|
|
|
|
att = MATH_Fast_Invert(att);
|
|
|
|
if(att >= ATTENUATION_THRESHOLD) {
|
|
float Hx = (Lx + Vx);
|
|
float Hy = (Ly + Vy);
|
|
float Hz = (Lz + Vz);
|
|
|
|
vec3f_normalize(Lx, Ly, Lz);
|
|
vec3f_normalize(Hx, Hy, Hz);
|
|
|
|
float LdotN = MATH_fipr(
|
|
Nx, Ny, Nz, 1.0f,
|
|
Lx, Ly, Lz, 1.0f
|
|
);
|
|
|
|
float NdotH = MATH_fipr(
|
|
Nx, Ny, Nz, 1.0f,
|
|
Hx, Hy, Hz, 1.0f
|
|
);
|
|
|
|
if(LdotN < 0.0f) LdotN = 0.0f;
|
|
if(NdotH < 0.0f) NdotH = 0.0f;
|
|
|
|
_glLightVertexPoint(
|
|
vertex->bgra,
|
|
i, LdotN, NdotH, att
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#undef LIGHT_COMPONENT
|