X-Git-Url: https://eleni.mutantstargoat.com/git/?p=lighthouse;a=blobdiff_plain;f=src%2Fgeom.cc;h=dae21f5369843b01397b0554f60863a829fd194c;hp=804c18f82b20064dc454c2fbcb8dd10a37ecbec9;hb=0c1863b54e2d9ff94a65fbe2dae07d213ca6de6d;hpb=d60954c471d6f446523bad8c4c4860aa2138da1e

diff --git a/src/geom.cc b/src/geom.cc
index 804c18f..dae21f5 100644
--- a/src/geom.cc
+++ b/src/geom.cc
@@ -1,20 +1,52 @@
+#include <math.h>
 #include <GL/glew.h>
 #include <GL/freeglut.h>
 #include "geom.h"
 #include "sdr.h"
 
 static unsigned int sdr_curve_top;
+static unsigned int tex_xcircle;
+
+static const unsigned char tex_xcircle_pixels[] = {
+	0, 64, 255, 255, 255, 255, 64, 0,
+	0, 64, 255, 255, 255, 255, 64, 0,
+	0, 64, 255, 255, 255, 255, 64, 0,
+	0, 64, 255, 255, 255, 255, 64, 0,
+	0, 64, 255, 255, 255, 255, 64, 0,
+	0, 64, 255, 255, 255, 255, 64, 0,
+	0, 64, 255, 255, 255, 255, 64, 0,
+	0, 64, 255, 255, 255, 255, 64, 0,
+
+	0, 64, 255, 255, 255, 255, 64, 0,
+	0, 0, 255, 255, 255, 255, 0, 0,
+	0, 0, 128, 255, 255, 128, 0, 0,
+	0, 0, 0, 64, 64, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0
+};
+
 
 bool init_geom()
 {
 	if(!(sdr_curve_top = create_program_load("sdr/curve_top.v.glsl", "sdr/curve_top.f.glsl"))) {
 		return false;
 	}
+
+	glGenTextures(1, &tex_xcircle);
+	glBindTexture(GL_TEXTURE_2D, tex_xcircle);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, 8, 16, 0,
+			GL_LUMINANCE, GL_UNSIGNED_BYTE, tex_xcircle_pixels);
 	return true;
 }
 
 void destroy_geom()
 {
+	glDeleteTextures(1, &tex_xcircle);
 	free_program(sdr_curve_top);
 }
 
@@ -112,6 +144,70 @@ void ground()
 	glPopMatrix();
 }
 
-void xlogo()
+void xlogo(float sz, const float *col_ink, const float *col_paper, float alpha, float xcircle)
 {
+	static const float xlogo_varr[] = {
+		-0.500, 0.407, -0.113, -0.109, 0.059, -0.006, -0.251, 0.407,
+		-0.113, -0.109, -0.499, -0.593, -0.410, -0.593, 0.059, -0.006,
+		-0.058, -0.182, 0.251, -0.593, 0.500, -0.593, 0.114, -0.079,
+		-0.058, -0.182, 0.114, -0.079, 0.500, 0.407, 0.411, 0.407
+	};
+
+	/* billboarding */
+	float mv[16];
+	glGetFloatv(GL_MODELVIEW_MATRIX, mv);
+	mv[0] = mv[5] = mv[10] = sz;
+	mv[1] = mv[2] = mv[4] = mv[6] = mv[8] = mv[9] = 0.0f;
+
+	glPushMatrix();
+	glLoadMatrixf(mv);
+	glTranslatef(0, 0.15, 0);
+
+	glPushAttrib(GL_ENABLE_BIT);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	glBegin(GL_QUADS);
+	glColor4f(col_ink[0], col_ink[1], col_ink[2], alpha);
+	const float *vptr = xlogo_varr;
+	for(int i=0; i<(int)(sizeof xlogo_varr / sizeof *xlogo_varr) / 2; i++) {
+		glVertex2fv(vptr);
+		vptr += 2;
+	}
+	glEnd();
+	glTranslatef(0, -0.15, 0);
+	glDisable(GL_BLEND);
+
+	glEnable(GL_TEXTURE_2D);
+	glBindTexture(GL_TEXTURE_2D, tex_xcircle);
+
+	glDisable(GL_CULL_FACE);
+	glEnable(GL_ALPHA_TEST);
+	float aref = 1.0f - xcircle;
+	glAlphaFunc(GL_GREATER, aref > 0.0f ? aref : 0.0f);
+
+	glScalef(1.4, 1, 1);
+
+#define XLOGO_CIRCLE_SEG	64
+	// circle thingy
+	glBegin(GL_QUAD_STRIP);
+	for(int i=0; i<XLOGO_CIRCLE_SEG; i++) {
+		float t = (float)i / (float)(XLOGO_CIRCLE_SEG - 1);
+		float tcol = fmod(t + 0.075f, 1.0f);
+
+		float theta = t * M_PI * 2.0f;
+		float rad = 0.4f;
+		float width = 0.05f * tcol;
+		float z = -cos(theta) * 0.1;
+
+		glColor4f(col_paper[0], col_paper[1], col_paper[2], tcol);
+		glTexCoord2f(0, 1.0f - tcol);
+		glVertex3f(sin(theta) * (rad + width), cos(theta) * (rad + width), z);
+		glTexCoord2f(1, 1.0f - tcol);
+		glVertex3f(sin(theta) * (rad - width), cos(theta) * (rad - width), z);
+	}
+	glEnd();
+
+	glPopAttrib();
+	glPopMatrix();
 }