Aegisub/aegisub/src/video_out_gl.cpp

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// Copyright (c) 2009, Thomas Goyne
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/
//
// $Id$
/// @file video_out_gl.cpp
/// @brief OpenGL based video renderer
/// @ingroup video
///
#include "config.h"
#ifndef AGI_PRE
#include <wx/log.h>
#endif
// These must be included before local headers.
#ifdef __APPLE__
#include <OpenGL/GL.h>
#include <OpenGL/glu.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif
#include "video_out_gl.h"
#include "utils.h"
#include "video_frame.h"
// Windows only has headers for OpenGL 1.1 and GL_CLAMP_TO_EDGE is 1.2
#ifndef GL_CLAMP_TO_EDGE
#define GL_CLAMP_TO_EDGE 0x812F
#endif
namespace {
/// @brief Structure tracking all precomputable information about a subtexture
struct TextureInfo {
/// The OpenGL texture id this is for
GLuint textureID;
/// The byte offset into the frame's data block
int dataOffset;
int sourceH;
int sourceW;
int textureH;
int textureW;
float destH;
float destW;
float destX;
float destY;
float texTop;
float texBottom;
float texLeft;
float texRight;
};
/// @brief Test if a texture can be created
/// @param width The width of the texture
/// @param height The height of the texture
/// @param format The texture's format
/// @return Whether the texture could be created.
bool TestTexture(int width, int height, GLint format) {
GLuint texture;
glGenTextures(1, &texture);
glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &format);
glDeleteTextures(1, &texture);
while (glGetError()) { } // Silently swallow all errors as we don't care why it failed if it did
wxLogDebug("VideoOutGL::TestTexture: %dx%d\n", width, height);
return format != 0;
}
}
VideoOutGL::VideoOutGL()
: maxTextureSize(0),
supportsRectangularTextures(false),
supportsGlClampToEdge(false),
internalFormat(0),
frameWidth(0),
frameHeight(0),
frameFormat(0),
textureIdList(),
textureList(),
textureCount(0),
textureRows(0),
textureCols(0),
lastFrame(-1)
{ }
/// @brief Runtime detection of required OpenGL capabilities
void VideoOutGL::DetectOpenGLCapabilities() {
if (maxTextureSize != 0) return;
// Test for supported internalformats
if (TestTexture(64, 64, GL_RGBA8)) internalFormat = GL_RGBA8;
else if (TestTexture(64, 64, GL_RGBA)) internalFormat = GL_RGBA;
else throw VideoOutUnsupportedException(L"Could not create a 64x64 RGB texture in any format.");
// Test for the maximum supported texture size
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTextureSize);
while (maxTextureSize > 64 && !TestTexture(maxTextureSize, maxTextureSize, internalFormat)) maxTextureSize >>= 1;
wxLogDebug("VideoOutGL::DetectOpenGLCapabilities: Maximum texture size is %dx%d\n", maxTextureSize, maxTextureSize);
// Test for rectangular texture support
supportsRectangularTextures = TestTexture(maxTextureSize, maxTextureSize >> 1, internalFormat);
// Test GL_CLAMP_TO_EDGE support
GLuint texture;
glGenTextures(1, &texture);
glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA8, 64, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
if (glGetError()) {
supportsGlClampToEdge = false;
wxLogDebug("VideoOutGL::DetectOpenGLCapabilities: Using GL_CLAMP\n");
}
else {
supportsGlClampToEdge = true;
wxLogDebug("VideoOutGL::DetectOpenGLCapabilities: Using GL_CLAMP_TO_EDGE\n");
}
}
/// @brief If needed, create the grid of textures for displaying frames of the given format
/// @param width The frame's width
/// @param height The frame's height
/// @param format The frame's format
/// @param bpp The frame's bytes per pixel
void VideoOutGL::InitTextures(int width, int height, GLenum format, int bpp) {
// Do nothing if the frame size and format are unchanged
if (width == frameWidth && height == frameHeight && format == frameFormat) return;
wxLogDebug("VideoOutGL::InitTextures: Video size: %dx%d\n", width, height);
DetectOpenGLCapabilities();
// Clean up old textures
if (textureIdList.size() > 0) {
glDeleteTextures(textureIdList.size(), &textureIdList[0]);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glDeleteTextures", err);
textureIdList.clear();
textureList.clear();
}
// Create the textures
textureRows = (int)ceil(double(height) / maxTextureSize);
textureCols = (int)ceil(double(width) / maxTextureSize);
textureIdList.resize(textureRows * textureCols);
textureList.resize(textureRows * textureCols);
glGenTextures(textureIdList.size(), &textureIdList[0]);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glGenTextures", err);
// Calculate the position information for each texture
int sourceY = 0;
float destY = 0.0f;
for (int i = 0; i < textureRows; i++) {
int sourceX = 0;
float destX = 0.0f;
int sourceH = maxTextureSize;
int textureH = maxTextureSize;
// If the last row doesn't need a full texture, shrink it to the smallest one possible
if (i == textureRows - 1 && height % maxTextureSize > 0) {
sourceH = height % maxTextureSize;
textureH = SmallestPowerOf2(sourceH);
}
for (int j = 0; j < textureCols; j++) {
TextureInfo& ti = textureList[i * textureCols + j];
// Copy the current position information into the struct
ti.destX = destX;
ti.destY = destY;
ti.sourceH = sourceH;
ti.sourceW = maxTextureSize;
int textureW = maxTextureSize;
// If the last column doesn't need a full texture, shrink it to the smallest one possible
if (j == textureCols - 1 && width % maxTextureSize > 0) {
ti.sourceW = width % maxTextureSize;
textureW = SmallestPowerOf2(ti.sourceW);
}
int w = textureW;
int h = textureH;
if (!supportsRectangularTextures) w = h = MAX(w, h);
if (supportsGlClampToEdge) {
ti.texLeft = 0.0f;
ti.texTop = 0.0f;
}
else {
// Stretch the texture a half pixel in each direction to eliminate the border
ti.texLeft = 1.0f / (2 * w);
ti.texTop = 1.0f / (2 * h);
}
ti.texRight = 1.0f - ti.texLeft;
ti.texBottom = 1.0f - ti.texTop;
// destW/H is the percent of the output which this texture covers
ti.destW = float(w) / width;
ti.destH = float(h) / height;
ti.textureID = textureIdList[i * textureCols + j];
ti.dataOffset = sourceY * width * bpp + sourceX * bpp;
// Actually create the texture and set the scaling mode
glBindTexture(GL_TEXTURE_2D, ti.textureID);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glBindTexture", err);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, w, h, 0, format, GL_UNSIGNED_BYTE, NULL);
wxLogDebug("VideoOutGL::InitTextures: Using texture size: %dx%d\n", w, h);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glTexImage2D", err);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glTexParameteri(GL_TEXTURE_MIN_FILTER)", err);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glTexParameteri(GL_TEXTURE_MAG_FILTER)", err);
GLint mode = supportsGlClampToEdge ? GL_CLAMP_TO_EDGE : GL_CLAMP;
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, mode);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glTexParameteri(GL_TEXTURE_WRAP_S)", err);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, mode);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glTexParameteri(GL_TEXTURE_WRAP_T)", err);
destX += ti.destW;
sourceX += ti.sourceW;
}
destY += float(sourceH) / height;
sourceY += sourceH;
}
// Store the information needed to know when the grid must be recreated
frameWidth = width;
frameHeight = height;
frameFormat = format;
}
void VideoOutGL::DisplayFrame(const AegiVideoFrame& frame, int frameNumber, int sw, int sh) {
if (frame.h == 0 || frame.w == 0) return;
if (frameNumber == -1) frameNumber = lastFrame;
glEnable(GL_TEXTURE_2D);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glEnable(GL_TEXTURE_2d)", err);
GLuint format = frame.invertChannels ? GL_BGRA_EXT : GL_RGBA;
InitTextures(frame.w, frame.h, format, frame.GetBpp(0));
// Set the row length, needed to be able to upload partial rows
glPixelStorei(GL_UNPACK_ROW_LENGTH, frame.w);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glPixelStorei(GL_UNPACK_ROW_LENGTH, FrameWidth)", err);
for (unsigned i = 0; i < textureList.size(); i++) {
TextureInfo& ti = textureList[i];
float destX = ti.destX * sw;
float destW = ti.destW * sw;
float destY = ti.destY * sh;
float destH = ti.destH * sh;
glBindTexture(GL_TEXTURE_2D, ti.textureID);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glBindTexture", err);
if (lastFrame != frameNumber) {
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, ti.sourceW, ti.sourceH, format, GL_UNSIGNED_BYTE, frame.data[0] + ti.dataOffset);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glTexSubImage2D", err);
}
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glColor4f", err);
float top, bottom;
if (frame.flipped) {
top = ti.texBottom;
bottom = ti.texTop;
}
else {
top = ti.texTop;
bottom = ti.texBottom;
}
glBegin(GL_QUADS);
glTexCoord2f(ti.texLeft, top); glVertex2f(destX, destY);
glTexCoord2f(ti.texRight, top); glVertex2f(destX + destW, destY);
glTexCoord2f(ti.texRight, bottom); glVertex2f(destX + destW, destY + destH);
glTexCoord2f(ti.texLeft, bottom); glVertex2f(destX, destY + destH);
glEnd();
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"GL_QUADS", err);
}
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glPixelStorei(GL_UNPACK_ROW_LENGTH, default)", err);
glDisable(GL_TEXTURE_2D);
if (GLenum err = glGetError()) throw VideoOutOpenGLException(L"glDisable(GL_TEXTURE_2d)", err);
lastFrame = frameNumber;
}
VideoOutGL::~VideoOutGL() {
if (textureIdList.size() > 0) {
glDeleteTextures(textureIdList.size(), &textureIdList[0]);
}
}