Initial 1.1.0 binary release

1 files changed, 484 insertions, 0 deletions

diff --git a/demo/opengl/imguiRenderGL.cpp b/demo/opengl/imguiRenderGL.cpp
new file mode 100644
index 0000000..bfb961e
--- /dev/null
+++ b/demo/opengl/imguiRenderGL.cpp
@@ -0,0 +1,484 @@
+//
+// Copyright (c) 2009-2010 Mikko Mononen [email protected]
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#define _USE_MATH_DEFINES
+#include <math.h>
+#include <stdio.h>
+
+#include "../imgui.h"
+
+#include "shader.h"
+
+// Some math headers don't have PI defined.
+static const float PI = 3.14159265f;
+
+void imguifree(void* ptr, void* userptr);
+void* imguimalloc(size_t size, void* userptr);
+
+#define STBTT_malloc(x,y)    imguimalloc(x,y)
+#define STBTT_free(x,y)      imguifree(x,y)
+#define STB_TRUETYPE_IMPLEMENTATION
+#include "../stb_truetype.h"
+
+void imguifree(void* ptr, void* /*userptr*/)
+{
+	free(ptr);
+}
+
+void* imguimalloc(size_t size, void* /*userptr*/)
+{
+	return malloc(size);
+}
+
+static const unsigned TEMP_COORD_COUNT = 100;
+static float g_tempCoords[TEMP_COORD_COUNT*2];
+static float g_tempNormals[TEMP_COORD_COUNT*2];
+
+static const int CIRCLE_VERTS = 8*4;
+static float g_circleVerts[CIRCLE_VERTS*2];
+
+static stbtt_bakedchar g_cdata[96]; // ASCII 32..126 is 95 glyphs
+static GLuint g_ftex = 0;
+
+inline unsigned int RGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+	return (r) | (g << 8) | (b << 16) | (a << 24);
+}
+
+static void drawPolygon(const float* coords, unsigned numCoords, float r, unsigned int col)
+{
+	if (numCoords > TEMP_COORD_COUNT) numCoords = TEMP_COORD_COUNT;
+	
+	for (unsigned i = 0, j = numCoords-1; i < numCoords; j=i++)
+	{
+		const float* v0 = &coords[j*2];
+		const float* v1 = &coords[i*2];
+		float dx = v1[0] - v0[0];
+		float dy = v1[1] - v0[1];
+		float d = sqrtf(dx*dx+dy*dy);
+		if (d > 0)
+		{
+			d = 1.0f/d;
+			dx *= d;
+			dy *= d;
+		}
+		g_tempNormals[j*2+0] = dy;
+		g_tempNormals[j*2+1] = -dx;
+	}
+	
+	for (unsigned i = 0, j = numCoords-1; i < numCoords; j=i++)
+	{
+		float dlx0 = g_tempNormals[j*2+0];
+		float dly0 = g_tempNormals[j*2+1];
+		float dlx1 = g_tempNormals[i*2+0];
+		float dly1 = g_tempNormals[i*2+1];
+		float dmx = (dlx0 + dlx1) * 0.5f;
+		float dmy = (dly0 + dly1) * 0.5f;
+		float	dmr2 = dmx*dmx + dmy*dmy;
+		if (dmr2 > 0.000001f)
+		{
+			float	scale = 1.0f / dmr2;
+			if (scale > 10.0f) scale = 10.0f;
+			dmx *= scale;
+			dmy *= scale;
+		}
+		g_tempCoords[i*2+0] = coords[i*2+0]+dmx*r;
+		g_tempCoords[i*2+1] = coords[i*2+1]+dmy*r;
+	}
+	
+	unsigned int colTrans = RGBA(col&0xff, (col>>8)&0xff, (col>>16)&0xff, 0);
+	
+	glBegin(GL_TRIANGLES);
+	
+	glColor4ubv((GLubyte*)&col);
+	
+	for (unsigned i = 0, j = numCoords-1; i < numCoords; j=i++)
+	{
+		glVertex2fv(&coords[i*2]);
+		glVertex2fv(&coords[j*2]);
+		glColor4ubv((GLubyte*)&colTrans);
+		glVertex2fv(&g_tempCoords[j*2]);
+		
+		glVertex2fv(&g_tempCoords[j*2]);
+		glVertex2fv(&g_tempCoords[i*2]);
+		
+		glColor4ubv((GLubyte*)&col);
+		glVertex2fv(&coords[i*2]);
+	}
+	
+	glColor4ubv((GLubyte*)&col);
+	for (unsigned i = 2; i < numCoords; ++i)
+	{
+		glVertex2fv(&coords[0]);
+		glVertex2fv(&coords[(i-1)*2]);
+		glVertex2fv(&coords[i*2]);
+	}
+	
+	glEnd();
+}
+
+static void drawRect(float x, float y, float w, float h, float fth, unsigned int col)
+{
+	float verts[4*2] =
+	{
+		x+0.5f, y+0.5f,
+		x+w-0.5f, y+0.5f,
+		x+w-0.5f, y+h-0.5f,
+		x+0.5f, y+h-0.5f,
+	};
+	drawPolygon(verts, 4, fth, col);
+}
+
+/*
+static void drawEllipse(float x, float y, float w, float h, float fth, unsigned int col)
+{
+	float verts[CIRCLE_VERTS*2];
+	const float* cverts = g_circleVerts;
+	float* v = verts;
+	
+	for (int i = 0; i < CIRCLE_VERTS; ++i)
+	{
+		*v++ = x + cverts[i*2]*w;
+		*v++ = y + cverts[i*2+1]*h;
+	}
+	
+	drawPolygon(verts, CIRCLE_VERTS, fth, col);
+}
+*/
+
+static void drawRoundedRect(float x, float y, float w, float h, float r, float fth, unsigned int col)
+{
+	const unsigned n = CIRCLE_VERTS/4;
+	float verts[(n+1)*4*2];
+	const float* cverts = g_circleVerts;
+	float* v = verts;
+	
+	for (unsigned i = 0; i <= n; ++i)
+	{
+		*v++ = x+w-r + cverts[i*2]*r;
+		*v++ = y+h-r + cverts[i*2+1]*r;
+	}
+	
+	for (unsigned i = n; i <= n*2; ++i)
+	{
+		*v++ = x+r + cverts[i*2]*r;
+		*v++ = y+h-r + cverts[i*2+1]*r;
+	}
+	
+	for (unsigned i = n*2; i <= n*3; ++i)
+	{
+		*v++ = x+r + cverts[i*2]*r;
+		*v++ = y+r + cverts[i*2+1]*r;
+	}
+	
+	for (unsigned i = n*3; i < n*4; ++i)
+	{
+		*v++ = x+w-r + cverts[i*2]*r;
+		*v++ = y+r + cverts[i*2+1]*r;
+	}
+	*v++ = x+w-r + cverts[0]*r;
+	*v++ = y+r + cverts[1]*r;
+	
+	drawPolygon(verts, (n+1)*4, fth, col);
+}
+
+
+static void drawLine(float x0, float y0, float x1, float y1, float r, float fth, unsigned int col)
+{
+	float dx = x1-x0;
+	float dy = y1-y0;
+	float d = sqrtf(dx*dx+dy*dy);
+	if (d > 0.0001f)
+	{
+		d = 1.0f/d;
+		dx *= d;
+		dy *= d;
+	}
+	float nx = dy;
+	float ny = -dx;
+	float verts[4*2];
+	r -= fth;
+	r *= 0.5f;
+	if (r < 0.01f) r = 0.01f;
+	dx *= r;
+	dy *= r;
+	nx *= r;
+	ny *= r;
+	
+	verts[0] = x0-dx-nx;
+	verts[1] = y0-dy-ny;
+	
+	verts[2] = x0-dx+nx;
+	verts[3] = y0-dy+ny;
+	
+	verts[4] = x1+dx+nx;
+	verts[5] = y1+dy+ny;
+	
+	verts[6] = x1+dx-nx;
+	verts[7] = y1+dy-ny;
+	
+	drawPolygon(verts, 4, fth, col);
+}
+
+
+bool imguiRenderGLInit(const char* fontpath)
+{
+	for (int i = 0; i < CIRCLE_VERTS; ++i)
+	{
+		float a = (float)i / (float)CIRCLE_VERTS * PI * 2;
+		g_circleVerts[i * 2 + 0] = cosf(a);
+		g_circleVerts[i * 2 + 1] = sinf(a);
+	}
+
+	// Load font.
+	FILE* fp = fopen(fontpath, "rb");
+	if (!fp) return false;
+	fseek(fp, 0, SEEK_END);
+	int size = ftell(fp);
+	fseek(fp, 0, SEEK_SET);
+
+	unsigned char* ttfBuffer = (unsigned char*)malloc(size);
+	if (!ttfBuffer)
+	{
+		fclose(fp);
+		return false;
+	}
+
+	size_t len = fread(ttfBuffer, 1, size, fp);
+	(void)len;
+
+	fclose(fp);
+	fp = 0;
+
+	unsigned char* bmap = (unsigned char*)malloc(512 * 512);
+	if (!bmap)
+	{
+		free(ttfBuffer);
+		return false;
+	}
+
+	stbtt_BakeFontBitmap(ttfBuffer, 0, 15.0f, bmap, 512, 512, 32, 96, g_cdata);
+
+	// can free ttf_buffer at this point
+	glVerify(glGenTextures(1, &g_ftex));
+	glVerify(glBindTexture(GL_TEXTURE_2D, g_ftex));
+	glVerify(glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512, 512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, bmap));
+	glVerify(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
+	glVerify(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
+
+	free(ttfBuffer);
+	free(bmap);
+
+	return true;
+}
+
+void imguiRenderGLDestroy()
+{
+	if (g_ftex)
+	{
+		glDeleteTextures(1, &g_ftex);
+		g_ftex = 0;
+	}
+}
+
+static void getBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index,
+						 float *xpos, float *ypos, stbtt_aligned_quad *q)
+{
+	stbtt_bakedchar *b = chardata + char_index;
+	int round_x = STBTT_ifloor(*xpos + b->xoff);
+	int round_y = STBTT_ifloor(*ypos - b->yoff);
+	
+	q->x0 = (float)round_x;
+	q->y0 = (float)round_y;
+	q->x1 = (float)round_x + b->x1 - b->x0;
+	q->y1 = (float)round_y - b->y1 + b->y0;
+	
+	q->s0 = b->x0 / (float)pw;
+	q->t0 = b->y0 / (float)pw;
+	q->s1 = b->x1 / (float)ph;
+	q->t1 = b->y1 / (float)ph;
+	
+	*xpos += b->xadvance;
+}
+
+static const float g_tabStops[4] = {150, 210, 270, 330};
+
+static float getTextLength(stbtt_bakedchar *chardata, const char* text)
+{
+	float xpos = 0;
+	float len = 0;
+	while (*text)
+	{
+		int c = (unsigned char)*text;
+		if (c == '\t')
+		{
+			for (int i = 0; i < 4; ++i)
+			{
+				if (xpos < g_tabStops[i])
+				{
+					xpos = g_tabStops[i];
+					break;
+				}
+			}
+		}
+		else if (c >= 32 && c < 128)
+		{
+			stbtt_bakedchar *b = chardata + c-32;
+			int round_x = STBTT_ifloor((xpos + b->xoff) + 0.5);
+			len = round_x + b->x1 - b->x0 + 0.5f;
+			xpos += b->xadvance;
+		}
+		++text;
+	}
+	return len;
+}
+
+static void drawText(float x, float y, const char *text, int align, unsigned int col)
+{
+	if (!g_ftex) return;
+	if (!text) return;
+	
+	if (align == IMGUI_ALIGN_CENTER)
+		x -= getTextLength(g_cdata, text)/2;
+	else if (align == IMGUI_ALIGN_RIGHT)
+		x -= getTextLength(g_cdata, text);
+	
+	glColor4ub(col&0xff, (col>>8)&0xff, (col>>16)&0xff, (col>>24)&0xff);
+	
+	glEnable(GL_TEXTURE_2D);
+	
+	// assume orthographic projection with units = screen pixels, origin at top left
+	glBindTexture(GL_TEXTURE_2D, g_ftex);
+	
+	glBegin(GL_TRIANGLES);
+	
+	const float ox = x;
+	
+	while (*text)
+	{
+		int c = (unsigned char)*text;
+		if (c == '\t')
+		{
+			for (int i = 0; i < 4; ++i)
+			{
+				if (x < g_tabStops[i]+ox)
+				{
+					x = g_tabStops[i]+ox;
+					break;
+				}
+			}
+		}
+		else if (c >= 32 && c < 128)
+		{			
+			stbtt_aligned_quad q;
+			getBakedQuad(g_cdata, 512,512, c-32, &x,&y,&q);
+			
+			glTexCoord2f(q.s0, q.t0);
+			glVertex2f(q.x0, q.y0);
+			glTexCoord2f(q.s1, q.t1);
+			glVertex2f(q.x1, q.y1);
+			glTexCoord2f(q.s1, q.t0);
+			glVertex2f(q.x1, q.y0);
+			
+			glTexCoord2f(q.s0, q.t0);
+			glVertex2f(q.x0, q.y0);
+			glTexCoord2f(q.s0, q.t1);
+			glVertex2f(q.x0, q.y1);
+			glTexCoord2f(q.s1, q.t1);
+			glVertex2f(q.x1, q.y1);
+		}
+		++text;
+	}
+	
+	glEnd();	
+	glDisable(GL_TEXTURE_2D);
+}
+
+
+void imguiRenderGLDraw()
+{
+	const imguiGfxCmd* q = imguiGetRenderQueue();
+	int nq = imguiGetRenderQueueSize();
+
+	const float s = 1.0f/8.0f;
+
+	glDisable(GL_SCISSOR_TEST);
+	for (int i = 0; i < nq; ++i)
+	{
+		const imguiGfxCmd& cmd = q[i];
+		if (cmd.type == IMGUI_GFXCMD_RECT)
+		{
+			if (cmd.rect.r == 0)
+			{
+				drawRect((float)cmd.rect.x*s+0.5f, (float)cmd.rect.y*s+0.5f,
+						 (float)cmd.rect.w*s-1, (float)cmd.rect.h*s-1,
+						 1.0f, cmd.col);
+			}
+			else
+			{
+				drawRoundedRect((float)cmd.rect.x*s+0.5f, (float)cmd.rect.y*s+0.5f,
+								(float)cmd.rect.w*s-1, (float)cmd.rect.h*s-1,
+								(float)cmd.rect.r*s, 1.0f, cmd.col);
+			}
+		}
+		else if (cmd.type == IMGUI_GFXCMD_LINE)
+		{
+			drawLine(cmd.line.x0*s, cmd.line.y0*s, cmd.line.x1*s, cmd.line.y1*s, cmd.line.r*s, 1.0f, cmd.col);
+		}
+		else if (cmd.type == IMGUI_GFXCMD_TRIANGLE)
+		{
+			if (cmd.flags == 1)
+			{
+				const float verts[3*2] =
+				{
+					(float)cmd.rect.x*s+0.5f, (float)cmd.rect.y*s+0.5f,
+					(float)cmd.rect.x*s+0.5f+(float)cmd.rect.w*s-1, (float)cmd.rect.y*s+0.5f+(float)cmd.rect.h*s/2-0.5f,
+					(float)cmd.rect.x*s+0.5f, (float)cmd.rect.y*s+0.5f+(float)cmd.rect.h*s-1,
+				};
+				drawPolygon(verts, 3, 1.0f, cmd.col);
+			}
+			if (cmd.flags == 2)
+			{
+				const float verts[3*2] =
+				{
+					(float)cmd.rect.x*s+0.5f, (float)cmd.rect.y*s+0.5f+(float)cmd.rect.h*s-1,
+					(float)cmd.rect.x*s+0.5f+(float)cmd.rect.w*s/2-0.5f, (float)cmd.rect.y*s+0.5f,
+					(float)cmd.rect.x*s+0.5f+(float)cmd.rect.w*s-1, (float)cmd.rect.y*s+0.5f+(float)cmd.rect.h*s-1,
+				};
+				drawPolygon(verts, 3, 1.0f, cmd.col);
+			}
+		}
+		else if (cmd.type == IMGUI_GFXCMD_TEXT)
+		{
+			drawText(cmd.text.x, cmd.text.y, cmd.text.text, cmd.text.align, cmd.col);
+		}
+		else if (cmd.type == IMGUI_GFXCMD_SCISSOR)
+		{
+			if (cmd.flags)
+			{
+				glEnable(GL_SCISSOR_TEST);
+				glScissor(cmd.rect.x, cmd.rect.y, cmd.rect.w, cmd.rect.h);
+			}
+			else
+			{
+				glDisable(GL_SCISSOR_TEST);
+			}
+		}
+	}
+	glDisable(GL_SCISSOR_TEST);
+}