qad/qglview/glrendererbase.cpp

/*
    QGLView
    Copyright (C) 2012  Ivan Pelipenko peri4ko@gmail.com

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "glrendererbase.h"
#include "globject.h"
#include "qglview.h"


GLRendererBase::GLRendererBase(QGLView * view_): view(*view_) {
	white_image = QImage(1, 1, QImage::Format_ARGB32);
	white_image.fill(0xFFFFFFFF);
	white_image_id = 0;
	violent_image = QImage(1, 1, QImage::Format_ARGB32);
	violent_image.fill(QColor(127, 127, 255));
	violent_image_id = 0;
}


void GLRendererBase::setupLight(const Light & l, int inpass_index, int gl_index) {
	QVector3D lp = l.worldPos(), ld = (l.itransform_ * QVector4D(l.direction, 0.)).toVector3D().normalized();
	GLfloat pos[] = {0.f, 0.f, 0.f, 0.f};
	GLfloat dir[] = {0.f, 0.f, 0.f};
	GLfloat col[] = {0.f, 0.f, 0.f};
	pos[0] = l.light_type == Light::Directional ? -l.direction.x() : lp.x();
	pos[1] = l.light_type == Light::Directional ? -l.direction.y() : lp.y();
	pos[2] = l.light_type == Light::Directional ? -l.direction.z() : lp.z();
	pos[3] = l.light_type == Light::Directional ? 0. : 1.;
	dir[0] = ld.x();
	dir[1] = ld.y();
	dir[2] = ld.z();
	col[0] = l.visible_ ? l.color().redF() * l.intensity : 0.;
	col[1] = l.visible_ ? l.color().greenF() * l.intensity : 0.;
	col[2] = l.visible_ ? l.color().blueF() * l.intensity : 0.;
	glEnable(gl_index);
	//glLightfv(gl_index, GL_AMBIENT, ambient);
	glLightfv(gl_index, GL_DIFFUSE, col);
	glLightfv(gl_index, GL_SPECULAR, col);
	glLightfv(gl_index, GL_POSITION, pos);
	glLightf(gl_index, GL_CONSTANT_ATTENUATION, l.decay_const);
	glLightf(gl_index, GL_LINEAR_ATTENUATION, l.decay_linear);
	glLightf(gl_index, GL_QUADRATIC_ATTENUATION, l.decay_quadratic);
	if (l.light_type == Light::Cone) {
		glLightfv(gl_index, GL_SPOT_DIRECTION, dir);
		glLightf(gl_index, GL_SPOT_CUTOFF, l.angle_spread);
		glLightf(gl_index, GL_SPOT_EXPONENT, l.angle_decay_exp);
	} else {
		glLightf(gl_index, GL_SPOT_CUTOFF, 180.);
	}

}


void GLRendererBase::setupAmbientLight(const QColor & a, bool first_pass) {
	GLfloat ambient[] = {0.0f, 0.0f, 0.0f, 1.f};
	if (first_pass) {
		ambient[0] = view.ambientColor_.redF();
		ambient[1] = view.ambientColor_.greenF();
		ambient[2] = view.ambientColor_.blueF();
	}
	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient);
}


void GLRendererBase::setupShadersLights(int lights_count) {
	/*foreach (QGLShaderProgram * i, view.shaders_ppl) {
		i->bind();
		i->setUniformValue("lightsCount", lights_count);
		i->setUniformValue("acc_light", lights_count > 0);
		//i->setUniformValue("mat", mvm);
	}*/
}


#define BIND_TEXTURE(ch, map) if (rp.prev_tex[ch] != mat.map.bitmap_id) { \
								rp.prev_tex[ch] = mat.map.bitmap_id; \
								glActiveTextureChannel(ch); glBindTexture(GL_TEXTURE_2D, mat.map.bitmap_id); \
								glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, view.anisotropicLevel_);}

void GLRendererBase::setupTextures(GLObjectBase & o, GLRendererBase::RenderingParameters & rp, bool first_object) {
	if (first_object) {
		glReleaseTextures();
		return;
	}
	setupShadersTextures(o, rp);
	Material & mat(o.material_);
	if (rp.light) {
		if (o.accept_light) {if (!rp.prev_light) {glSetLightEnabled(true); rp.prev_light = true;}}
		else {if (rp.prev_light) {glSetLightEnabled(false); rp.prev_light = false;}}
	}
	if (rp.fog) {
		if (o.accept_fog) {if (!rp.prev_fog) {glSetFogEnabled(true); rp.prev_fog = true;}}
		else {if (rp.prev_fog) {glSetFogEnabled(false); rp.prev_fog = false;}}
	}
	if (rp.textures) {
		BIND_TEXTURE(0, map_diffuse);
		BIND_TEXTURE(1, map_normal);
		BIND_TEXTURE(2, map_relief);
		BIND_TEXTURE(3, map_self_illumination);
		BIND_TEXTURE(4, map_specularity);
		BIND_TEXTURE(5, map_specular);
		glActiveTextureChannel(0);
	}
}

#undef BIND_TEXTURE


void GLRendererBase::setupLights(int pass, int lights_per_pass) {
	int light_start, light_end, lmax;
	light_start = pass * lights_per_pass;
	light_end = qMin<int>((pass + 1) * lights_per_pass, view.lights_.size());
	setupAmbientLight(view.ambientColor_, pass == 0);
	if (!view.lights_.isEmpty()) {
		setupShadersLights(light_end - light_start);
		for (int i = light_start; i < light_end; ++i)
			setupLight(*view.lights_[i], i - light_start, GL_LIGHT0 + i - light_start);
		lmax = light_start + 8;
		for (int i = light_end; i < lmax; ++i)
			glDisable(GL_LIGHT0 + i - light_start);
	} else {
		setupShadersLights(0);
		for (int i = 0; i < 8; ++i)
			glDisable(GL_LIGHT0 + i);
	}
}


void GLRendererBase::applyFilteringParameters() {
	if (view.linearFiltering_) {
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
	} else {
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
	}
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, view.anisotropicLevel_);
}


void GLRendererBase::renderObjects(int pass, int light_pass, void * shaders, bool textures, bool light, bool fog) {
	RenderingParameters rp;
	rp.pass = pass;
	rp.light_pass = light_pass;
	rp.shaders = shaders;
	rp.textures = textures;
	rp.light = rp.prev_light = light;
	rp.fog = rp.prev_fog = fog;
	rp.view_matrix = getGLMatrix(GL_MODELVIEW_MATRIX);
	rp.proj_matrix = getGLMatrix(GL_PROJECTION_MATRIX);
	//qDebug() << "view:" << rp.view_matrix;
	for (int i = 0; i < 32; ++i) rp.prev_tex[i] = 0;
	setupTextures(view.objects_, rp, true);
	glSetLightEnabled(rp.prev_light);
	glSetFogEnabled(rp.prev_fog);
	glSetCapEnabled(GL_TEXTURE_2D, rp.textures);
	glSetCapEnabled(GL_BLEND, pass == GLObjectBase::Transparent);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glDisable(GL_TEXTURE_CUBE_MAP);
	glPushMatrix();
	renderSingleObject(view.objects_, rp);
	glPopMatrix();
}


void GLRendererBase::renderSingleObject(GLObjectBase & o, RenderingParameters & rp) {
	if (!o.isInit())
		o.init();
	if (!o.isTexturesLoaded())
		o.loadTextures();
	if (!o.visible_) return;
	if (rp.pass == o.pass_) {
		Material & mat(o.material_);
		QMatrix4x4 curview = rp.view_matrix * o.itransform_;
		setupTextures(o, rp, false);
		mat.apply((QGLShaderProgram*)rp.shaders);
		glSetPolygonMode(o.render_mode != GLObjectBase::View ? o.render_mode : (view.rmode != GLObjectBase::View ? view.rmode : GL_FILL));
		glLineWidth(o.line_width > 0. ? o.line_width : view.lineWidth_);
		glPointSize(o.line_width > 0. ? o.line_width : view.lineWidth_);
		o.update();
		if (o.pass_ == GLObjectBase::Transparent) {
			glActiveTextureChannel(3);
			if (mat.reflectivity > 0.) {
				glEnable(GL_TEXTURE_CUBE_MAP);
				if (!mat.map_reflection.isEmpty()) mat.map_reflection.bind();
				else glDisable(GL_TEXTURE_CUBE_MAP);
			} else glDisable(GL_TEXTURE_CUBE_MAP);
			if (rp.light_pass > 0) glDisable(GL_TEXTURE_CUBE_MAP);
			GLfloat gm[16], bc[4] = {mat.reflectivity, mat.reflectivity, mat.reflectivity, mat.reflectivity};
			glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
			glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_INTERPOLATE);
			glTexEnvi(GL_TEXTURE_ENV, GL_SRC2_RGB, GL_CONSTANT);
			glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB, GL_SRC_COLOR);
			glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, bc);
			glGetFloatv(GL_MODELVIEW_MATRIX, gm);
			glMatrixMode(GL_TEXTURE);
			glLoadTransposeMatrixf(gm);
			glScalef(-1., -1., -1.);
			glMatrixMode(GL_MODELVIEW);
			glActiveTextureChannel(0);
		}
		if (rp.shaders) {
			//qDebug() << o.name() << curview << curview.determinant();
			setUniformMatrices((QGLShaderProgram*)rp.shaders, rp.proj_matrix, curview);
		} else {
			glMatrixMode(GL_MODELVIEW);
			setGLMatrix(curview);
		}
		o.draw((QGLShaderProgram*)rp.shaders);
	}
	foreach (GLObjectBase * i, o.children_)
		renderSingleObject(*i, rp);
}