initial commit

1 files changed, 446 insertions, 0 deletions

diff --git a/src/render.c b/src/render.c
new file mode 100644
index 0000000..e126133
--- /dev/null
+++ b/src/render.c
@@ -0,0 +1,446 @@
+/* 
+*  BSD 2-Clause “Simplified” License
+*  Copyright (c) 2019, Aldrik Ramaekers, aldrik.ramaekers@protonmail.com
+*  All rights reserved.
+*/
+
+inline void render_clear()
+{
+	glClearColor(255/255.0, 255/255.0, 255/255.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+}
+
+inline void render_set_rotation(float32 rotation, float32 x, float32 y, s32 depth)
+{
+	glRotatef(rotation, x, y, depth);
+}
+
+inline void set_render_depth(s32 depth)
+{
+	render_depth = depth;
+}
+
+void render_image(image *image, s32 x, s32 y, s32 width, s32 height)
+{
+	assert(image);
+	if (image->loaded)
+	{
+		glBindTexture(GL_TEXTURE_2D, image->textureID);
+		glEnable(GL_TEXTURE_2D);
+		glBegin(GL_QUADS);
+		glColor4f(1., 1., 1., 1.);
+		glTexCoord2i(0, 0); glVertex3i(x, y, render_depth);
+		glTexCoord2i(0, 1); glVertex3i(x, y+height, render_depth);
+		glTexCoord2i(1, 1); glVertex3i(x+width, y+height, render_depth);
+		glTexCoord2i(1, 0); glVertex3i(x+width, y, render_depth);
+		glEnd();
+		
+		glDisable(GL_TEXTURE_2D);
+	}
+}
+
+void render_image_tint(image *image, s32 x, s32 y, s32 width, s32 height, color tint)
+{
+	assert(image);
+	if (image->loaded)
+	{
+		glBindTexture(GL_TEXTURE_2D, image->textureID);
+		glEnable(GL_TEXTURE_2D);
+		glBegin(GL_QUADS);
+		glColor4f(tint.r/255.0f, tint.g/255.0f, tint.b/255.0f, tint.a/255.0f); 
+		glTexCoord2i(0, 0); glVertex3i(x, y, render_depth);
+		glTexCoord2i(0, 1); glVertex3i(x, y+height, render_depth);
+		glTexCoord2i(1, 1); glVertex3i(x+width, y+height, render_depth);
+		glTexCoord2i(1, 0); glVertex3i(x+width, y, render_depth);
+		glEnd();
+		
+		glDisable(GL_TEXTURE_2D);
+	}
+}
+
+s32 render_text_ellipsed(font *font, s32 x, s32 y, s32 maxw, char *text, color tint)
+{
+	if (!font->loaded)
+		return 0;
+	
+	glEnable(GL_TEXTURE_2D);
+	glColor4f(tint.r/255.0f, tint.g/255.0f, tint.b/255.0f, tint.a/255.0f); 
+	
+	char *ellipse = "...";
+	bool in_ellipse = false;
+	
+	s32 x_ = x;
+	utf8_int32_t ch;
+	while((text = utf8codepoint(text, &ch)) && ch)
+	{
+		if (ch == 9) ch = 32;
+		utf8_int32_t ch_next;
+		utf8codepoint(text, &ch_next);
+		if (ch < TEXT_CHARSET_START || ch > TEXT_CHARSET_END) 
+		{
+			ch = 0x3f;
+		}
+		
+		glyph g = font->glyphs[ch];
+		
+		glBindTexture(GL_TEXTURE_2D, g.textureID);
+		glBegin(GL_QUADS);
+		
+		s32 width = g.width;
+		
+		s32 y_ = y + font->px_h + g.yoff;
+		
+		glTexCoord2i(0, 0); glVertex3i(x_,y_, render_depth);
+		glTexCoord2i(0, 1); glVertex3i(x_,y_+g.height, render_depth);
+		glTexCoord2i(1, 1); glVertex3i(x_+g.width,y_+g.height, render_depth);
+		glTexCoord2i(1, 0); glVertex3i(x_+g.width,y_, render_depth);
+		
+		glEnd();
+		
+		/* add kerning */
+		int kern = stbtt_GetCodepointKernAdvance(&font->info, ch, ch_next);
+		if (kern != 0) x_ += kern * font->scale;
+		x_ += g.width+g.xoff;
+		
+		if (!in_ellipse && (x_-x) > maxw-(font->glyphs['.'].width*3))
+		{
+			in_ellipse = true;
+			text = ellipse;
+		}
+	}
+	
+	glDisable(GL_TEXTURE_2D);
+	
+	return maxw;
+}
+
+s32 render_text(font *font, s32 x, s32 y, char *text, color tint)
+{
+	if (!font->loaded)
+		return 0;
+	
+	glEnable(GL_TEXTURE_2D);
+	glColor4f(tint.r/255.0f, tint.g/255.0f, tint.b/255.0f, tint.a/255.0f); 
+	
+	s32 x_ = x;
+	utf8_int32_t ch;
+	while((text = utf8codepoint(text, &ch)) && ch)
+	{
+		if (ch == 9) ch = 32;
+		utf8_int32_t ch_next;
+		utf8codepoint(text, &ch_next);
+		if (ch < TEXT_CHARSET_START || ch > TEXT_CHARSET_END) 
+		{
+			ch = 0x3f;
+		}
+		
+		glyph g = font->glyphs[ch];
+		
+		glBindTexture(GL_TEXTURE_2D, g.textureID);
+		glBegin(GL_QUADS);
+		
+		s32 width = g.width;
+		
+		s32 y_ = y + font->px_h + g.yoff;
+		
+		glTexCoord2i(0, 0); glVertex3i(x_,y_, render_depth);
+		glTexCoord2i(0, 1); glVertex3i(x_,y_+g.height, render_depth);
+		glTexCoord2i(1, 1); glVertex3i(x_+g.width,y_+g.height, render_depth);
+		glTexCoord2i(1, 0); glVertex3i(x_+g.width,y_, render_depth);
+		
+		glEnd();
+		
+		/* add kerning */
+		int kern = stbtt_GetCodepointKernAdvance(&font->info, ch, ch_next);
+		if (kern != 0) x_ += kern * font->scale;
+		x_ += g.width+g.xoff;
+	}
+	
+	glDisable(GL_TEXTURE_2D);
+	
+	return x_ - x;
+}
+
+s32 render_text_cutoff(font *font, s32 x, s32 y, char *text, color tint, u16 cutoff_width)
+{
+	if (!font->loaded)
+		return 0;
+	
+	glEnable(GL_TEXTURE_2D);
+	glColor4f(tint.r/255.0f, tint.g/255.0f, tint.b/255.0f, tint.a/255.0f); 
+	
+	s32 x_ = x;
+	s32 y_ = y;
+	bool is_new_line = false;
+	utf8_int32_t ch;
+	while((text = utf8codepoint(text, &ch)) && ch)
+	{
+		if (ch == 9) ch = 32;
+		utf8_int32_t ch_next;
+		utf8codepoint(text, &ch_next);
+		if (ch < TEXT_CHARSET_START || ch > TEXT_CHARSET_END) 
+		{
+			ch = 0x3f;
+		}
+		
+		if (ch == '\n')
+		{
+			x_ = x;
+			y_ += font->size;
+			is_new_line = true;
+			continue;
+		}
+		
+		if (is_new_line && ch == ' ')
+		{
+			is_new_line = false;
+			continue;
+		}
+		else if (is_new_line && ch != ' ')
+		{
+			is_new_line = false;
+		}
+		
+		
+		glyph g = font->glyphs[ch];
+		
+		glBindTexture(GL_TEXTURE_2D, g.textureID);
+		glBegin(GL_QUADS);
+		
+		s32 width = g.width;
+		
+		s32 y__ = y_ + font->px_h + g.yoff;
+		
+		glTexCoord2i(0, 0); glVertex3i(x_,y__, render_depth);
+		glTexCoord2i(0, 1); glVertex3i(x_,y__+g.height, render_depth);
+		glTexCoord2i(1, 1); glVertex3i(x_+g.width,y__+g.height, render_depth);
+		glTexCoord2i(1, 0); glVertex3i(x_+g.width,y__, render_depth);
+		
+		glEnd();
+		
+		int kern = stbtt_GetCodepointKernAdvance(&font->info, ch, ch_next);
+		if (kern != 0) x_ += kern * font->scale;
+		
+		x_ += g.width+g.xoff;
+		if (x_ > x+cutoff_width)
+		{
+			x_ = x;
+			y_ += font->size;
+			is_new_line = true;
+		}
+	}
+	
+	glDisable(GL_TEXTURE_2D);
+	
+	return (y_ - y) + font->size;
+	
+}
+
+s32 calculate_cursor_position(font *font, char *text, s32 click_x)
+{
+	if (!font->loaded)
+		return 0;
+	
+	s32 x = 0;
+	s32 index = 0;
+	utf8_int32_t ch;
+	while((text = utf8codepoint(text, &ch)) && ch)
+	{
+		if (ch == 9) ch = 32;
+		utf8_int32_t ch_next;
+		utf8codepoint(text, &ch_next);
+		if (ch < TEXT_CHARSET_START || ch > TEXT_CHARSET_END) 
+		{
+			ch = 0x3f;
+		}
+		
+		
+		glyph g = font->glyphs[ch];
+		
+		s32 width = g.width;
+		s32 width_next = font->glyphs[ch_next].width;
+		
+		int kern = stbtt_GetCodepointKernAdvance(&font->info, ch, ch_next);
+		if (kern != 0) x += kern * font->scale;
+		
+		x += g.width+g.xoff;
+		
+		if (x - (width_next/5) > click_x)
+		{
+			return index;
+		}
+		
+		++index;
+	}
+	
+	return index;
+}
+
+s32 calculate_text_width_from_upto(font *font, char *text, s32 from, s32 index)
+{
+	if (!font->loaded)
+		return 0;
+	
+	s32 x = 0;
+	utf8_int32_t ch;
+	s32 i = 0;
+	while((text = utf8codepoint(text, &ch)) && ch)
+	{
+		if (index == i) return x;
+		
+		if (ch == 9) ch = 32;
+		utf8_int32_t ch_next;
+		utf8codepoint(text, &ch_next);
+		if (ch < TEXT_CHARSET_START || ch > TEXT_CHARSET_END) 
+		{
+			ch = 0x3f;
+		}
+		
+		glyph g = font->glyphs[ch];
+		s32 width = g.width;
+		
+		if (i >= from)
+		{
+			int kern = stbtt_GetCodepointKernAdvance(&font->info, ch, ch_next);
+			if (kern != 0) x += kern * font->scale;
+			
+			x += g.width+g.xoff;
+		}
+		
+		i++;
+	}
+	
+	return x;
+}
+
+s32 calculate_text_width_upto(font *font, char *text, s32 index)
+{
+	if (!font->loaded)
+		return 0;
+	
+	s32 x = 0;
+	utf8_int32_t ch;
+	s32 i = 0;
+	while((text = utf8codepoint(text, &ch)) && ch)
+	{
+		if (index == i) return x;
+		
+		if (ch == 9) ch = 32;
+		utf8_int32_t ch_next;
+		utf8codepoint(text, &ch_next);
+		if (ch < TEXT_CHARSET_START || ch > TEXT_CHARSET_END) 
+		{
+			ch = 0x3f;
+		}
+		
+		glyph g = font->glyphs[ch];
+		s32 width = g.width;
+		
+		int kern = stbtt_GetCodepointKernAdvance(&font->info, ch, ch_next);
+		if (kern != 0) x += kern * font->scale;
+		
+		x += g.width+g.xoff;
+		
+		i++;
+	}
+	
+	return x;
+}
+
+s32 calculate_text_width(font *font, char *text)
+{
+	if (!font->loaded)
+		return 0;
+	
+	s32 x = 0;
+	utf8_int32_t ch;
+	while((text = utf8codepoint(text, &ch)) && ch)
+	{
+		if (ch == 9) ch = 32;
+		utf8_int32_t ch_next;
+		utf8codepoint(text, &ch_next);
+		if (ch < TEXT_CHARSET_START || ch > TEXT_CHARSET_END) 
+		{
+			ch = 0x3f;
+		}
+		
+		glyph g = font->glyphs[ch];
+		s32 width = g.width;
+		
+		int kern = stbtt_GetCodepointKernAdvance(&font->info, ch, ch_next);
+		if (kern != 0) x += kern * font->scale;
+		
+		x += g.width+g.xoff;
+	}
+	
+	return x;
+}
+
+void render_triangle(s32 x, s32 y, s32 w, s32 h, color tint)
+{
+	glBegin(GL_TRIANGLES);
+	glColor4f(tint.r/255.0f, tint.g/255.0f, tint.b/255.0f, tint.a/255.0f); 
+	glVertex3i(x+(w/2), y+h, render_depth);
+	glVertex3i(x, y, render_depth);
+	glVertex3i(x+w, y, render_depth);
+	glEnd();
+}
+
+void render_rectangle(s32 x, s32 y, s32 width, s32 height, color tint)
+{
+	glBegin(GL_QUADS);
+	glColor4f(tint.r/255.0f, tint.g/255.0f, tint.b/255.0f, tint.a/255.0f); 
+	glVertex3i(x, y, render_depth);
+	glVertex3i(x, y+height, render_depth);
+	glVertex3i(x+width, y+height, render_depth);
+	glVertex3i(x+width, y, render_depth);
+	glEnd();
+}
+
+void render_rectangle_tint(s32 x, s32 y, s32 width, s32 height, color tint[4])
+{
+	glBegin(GL_QUADS);
+	glColor4f(tint[0].r/255.0f, tint[0].g/255.0f, tint[0].b/255.0f, tint[0].a/255.0f);
+	glVertex3i(x, y, render_depth);
+	glColor4f(tint[1].r/255.0f, tint[1].g/255.0f, tint[1].b/255.0f, tint[1].a/255.0f);
+	glVertex3i(x, y+height, render_depth);
+	glColor4f(tint[2].r/255.0f, tint[2].g/255.0f, tint[2].b/255.0f, tint[2].a/255.0f); 
+	glVertex3i(x+width, y+height, render_depth);
+	glColor4f(tint[3].r/255.0f, tint[3].g/255.0f, tint[3].b/255.0f, tint[3].a/255.0f);
+	glVertex3i(x+width, y, render_depth);
+	glEnd();
+}
+
+void render_rectangle_outline(s32 x, s32 y, s32 width, s32 height, u16 outline_w, color tint)
+{
+	// left
+	render_rectangle(x, y, outline_w, height, tint);
+	// right
+	render_rectangle(x+width-outline_w, y, outline_w, height, tint);
+	// top
+	render_rectangle(x+outline_w, y, width-(outline_w*2), outline_w, tint);
+	// bottom
+	render_rectangle(x+outline_w, y+height-outline_w, width-(outline_w*2), outline_w, tint);
+}
+
+void render_set_scissor(platform_window *window, s32 x, s32 y, s32 w, s32 h)
+{
+	glEnable(GL_SCISSOR_TEST);
+	glScissor(x-1, window->height-h-y-1, w+1, h+1);
+}
+
+vec4 render_get_scissor()
+{
+	vec4 vec;
+	glGetIntegerv(GL_SCISSOR_BOX, (GLint*)(&vec));
+	vec.x += 1;
+	vec.y += 1;
+	vec.w -= 1;
+	vec.h -= 1;
+	return vec;
+}
+
+void render_reset_scissor()
+{
+	glDisable(GL_SCISSOR_TEST);
+}
\ No newline at end of file