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/* Copyright (C) 2018 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. 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 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "TextRenderer.h"
#include "graphics/Font.h"
#include "graphics/FontManager.h"
#include "graphics/ShaderProgram.h"
#include "lib/ogl.h"
#include "ps/CStrIntern.h"
#include "ps/GameSetup/Config.h"
#include "renderer/Renderer.h"
CTextRenderer::CTextRenderer(const CShaderProgramPtr& shader) :
m_Shader(shader)
{
ResetTransform();
Color(CColor(1.0f, 1.0f, 1.0f, 1.0f));
Font(str_sans_10);
}
void CTextRenderer::ResetTransform()
{
float xres = g_xres / g_GuiScale;
float yres = g_yres / g_GuiScale;
m_Transform.SetIdentity();
m_Transform.Scale(1.0f, -1.f, 1.0f);
m_Transform.Translate(0.0f, yres, -1000.0f);
CMatrix3D proj;
proj.SetOrtho(0.f, xres, 0.f, yres, -1.f, 1000.f);
m_Transform = proj * m_Transform;
m_Dirty = true;
}
CMatrix3D CTextRenderer::GetTransform()
{
return m_Transform;
}
void CTextRenderer::SetTransform(const CMatrix3D& transform)
{
m_Transform = transform;
m_Dirty = true;
}
void CTextRenderer::Translate(float x, float y, float z)
{
CMatrix3D m;
m.SetTranslation(x, y, z);
m_Transform = m_Transform * m;
m_Dirty = true;
}
void CTextRenderer::SetClippingRect(const CRect& rect)
{
m_Clipping = rect;
}
void CTextRenderer::Color(const CColor& color)
{
if (m_Color != color)
{
m_Color = color;
m_Dirty = true;
}
}
void CTextRenderer::Color(float r, float g, float b, float a)
{
Color(CColor(r, g, b, a));
}
void CTextRenderer::Font(CStrIntern font)
{
if (font != m_FontName)
{
m_FontName = font;
m_Font = g_Renderer.GetFontManager().LoadFont(font);
m_Dirty = true;
}
}
void CTextRenderer::PrintfAdvance(const wchar_t* fmt, ...)
{
wchar_t buf[1024] = {0};
va_list args;
va_start(args, fmt);
int ret = vswprintf(buf, ARRAY_SIZE(buf)-1, fmt, args);
va_end(args);
if (ret < 0)
debug_printf("CTextRenderer::Printf vswprintf failed (buffer size exceeded?) - return value %d, errno %d\n", ret, errno);
PutAdvance(buf);
}
void CTextRenderer::PrintfAt(float x, float y, const wchar_t* fmt, ...)
{
wchar_t buf[1024] = {0};
va_list args;
va_start(args, fmt);
int ret = vswprintf(buf, ARRAY_SIZE(buf)-1, fmt, args);
va_end(args);
if (ret < 0)
debug_printf("CTextRenderer::PrintfAt vswprintf failed (buffer size exceeded?) - return value %d, errno %d\n", ret, errno);
Put(x, y, buf);
}
void CTextRenderer::PutAdvance(const wchar_t* buf)
{
Put(0.0f, 0.0f, buf);
int w, h;
m_Font->CalculateStringSize(buf, w, h);
Translate((float)w, 0.0f, 0.0f);
}
void CTextRenderer::Put(float x, float y, const wchar_t* buf)
{
if (buf[0] == 0)
return; // empty string; don't bother storing
PutString(x, y, new std::wstring(buf), true);
}
void CTextRenderer::Put(float x, float y, const char* buf)
{
if (buf[0] == 0)
return; // empty string; don't bother storing
PutString(x, y, new std::wstring(wstring_from_utf8(buf)), true);
}
void CTextRenderer::Put(float x, float y, const std::wstring* buf)
{
if (buf->empty())
return; // empty string; don't bother storing
PutString(x, y, buf, false);
}
void CTextRenderer::PutString(float x, float y, const std::wstring* buf, bool owned)
{
if (!m_Font)
return; // invalid font; can't render
if (m_Clipping != CRect())
{
float x0, y0, x1, y1;
m_Font->GetGlyphBounds(x0, y0, x1, y1);
if (y + y1 < m_Clipping.top)
return;
if (y + y0 > m_Clipping.bottom)
return;
}
// If any state has changed since the last batch, start a new batch
if (m_Dirty)
{
SBatch batch;
batch.chars = 0;
batch.transform = m_Transform;
batch.color = m_Color;
batch.font = m_Font;
m_Batches.push_back(batch);
m_Dirty = false;
}
// Push a new run onto the latest batch
SBatchRun run;
run.x = x;
run.y = y;
m_Batches.back().runs.push_back(run);
m_Batches.back().runs.back().text = buf;
m_Batches.back().runs.back().owned = owned;
m_Batches.back().chars += buf->size();
}
struct t2f_v2i
{
t2f_v2i() : u(0), v(0), x(0), y(0) { }
float u, v;
i16 x, y;
};
struct SBatchCompare
{
bool operator()(const CTextRenderer::SBatch& a, const CTextRenderer::SBatch& b)
{
if (a.font < b.font)
return true;
if (b.font < a.font)
return false;
// TODO: is it worth sorting by color/transform too?
return false;
}
};
void CTextRenderer::Render()
{
std::vector<u16> indexes;
std::vector<t2f_v2i> vertexes;
// Try to merge non-consecutive batches that share the same font/color/transform:
// sort the batch list by font, then merge the runs of adjacent compatible batches
m_Batches.sort(SBatchCompare());
for (std::list<SBatch>::iterator it = m_Batches.begin(); it != m_Batches.end(); )
{
std::list<SBatch>::iterator next = it;
++next;
if (next != m_Batches.end() && it->font == next->font && it->color == next->color && it->transform == next->transform)
{
it->chars += next->chars;
it->runs.splice(it->runs.end(), next->runs);
m_Batches.erase(next);
}
else
++it;
}
for (std::list<SBatch>::iterator it = m_Batches.begin(); it != m_Batches.end(); ++it)
{
SBatch& batch = *it;
const CFont::GlyphMap& glyphs = batch.font->GetGlyphs();
m_Shader->BindTexture(str_tex, batch.font->GetTexture());
m_Shader->Uniform(str_transform, batch.transform);
// ALPHA-only textures will have .rgb sampled as 0, so we need to
// replace it with white (but not affect RGBA textures)
if (batch.font->HasRGB())
m_Shader->Uniform(str_colorAdd, CColor(0.0f, 0.0f, 0.0f, 0.0f));
else
m_Shader->Uniform(str_colorAdd, CColor(1.0f, 1.0f, 1.0f, 0.0f));
m_Shader->Uniform(str_colorMul, batch.color);
vertexes.resize(batch.chars*4);
indexes.resize(batch.chars*6);
size_t idx = 0;
for (std::list<SBatchRun>::iterator runit = batch.runs.begin(); runit != batch.runs.end(); ++runit)
{
SBatchRun& run = *runit;
i16 x = run.x;
i16 y = run.y;
for (size_t i = 0; i < run.text->size(); ++i)
{
const CFont::GlyphData* g = glyphs.get((*run.text)[i]);
if (!g)
g = glyphs.get(0xFFFD); // Use the missing glyph symbol
if (!g) // Missing the missing glyph symbol - give up
continue;
vertexes[idx*4].u = g->u1;
vertexes[idx*4].v = g->v0;
vertexes[idx*4].x = g->x1 + x;
vertexes[idx*4].y = g->y0 + y;
vertexes[idx*4+1].u = g->u0;
vertexes[idx*4+1].v = g->v0;
vertexes[idx*4+1].x = g->x0 + x;
vertexes[idx*4+1].y = g->y0 + y;
vertexes[idx*4+2].u = g->u0;
vertexes[idx*4+2].v = g->v1;
vertexes[idx*4+2].x = g->x0 + x;
vertexes[idx*4+2].y = g->y1 + y;
vertexes[idx*4+3].u = g->u1;
vertexes[idx*4+3].v = g->v1;
vertexes[idx*4+3].x = g->x1 + x;
vertexes[idx*4+3].y = g->y1 + y;
indexes[idx*6+0] = static_cast<u16>(idx*4+0);
indexes[idx*6+1] = static_cast<u16>(idx*4+1);
indexes[idx*6+2] = static_cast<u16>(idx*4+2);
indexes[idx*6+3] = static_cast<u16>(idx*4+2);
indexes[idx*6+4] = static_cast<u16>(idx*4+3);
indexes[idx*6+5] = static_cast<u16>(idx*4+0);
x += g->xadvance;
idx++;
}
}
m_Shader->VertexPointer(2, GL_SHORT, sizeof(t2f_v2i), &vertexes[0].x);
m_Shader->TexCoordPointer(GL_TEXTURE0, 2, GL_FLOAT, sizeof(t2f_v2i), &vertexes[0].u);
glDrawElements(GL_TRIANGLES, indexes.size(), GL_UNSIGNED_SHORT, &indexes[0]);
}
m_Batches.clear();
}
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