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
#define CHECK_INIT_ERROR(cmd) cmd; if (GLenum err = glGetError()) throw VideoOutInitException(_T(#cmd), err)
#define CHECK_ERROR(cmd) cmd; if (GLenum err = glGetError()) throw VideoOutRenderException(_T(#cmd), err)
/// @brief Structure tracking all precomputable information about a subtexture
struct VideoOutGL::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;
float destX1;
float destY1;
float destX2;
float destY2;
float texTop;
float texBottom;
float texLeft;
float texRight;
TextureInfo()
: textureID(0)
, dataOffset(0)
, sourceH(0)
, sourceW(0)
, destX1(0)
, destY1(0)
, destX2(0)
, destY2(0)
, texTop(0)
, texBottom(1.0f)
, texLeft(0)
, texRight(1.0f)
{ }
};
/// @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.
static bool TestTexture(int width, int height, GLint format) {
glTexImage2D(GL_PROXY_TEXTURE_2D, 0, format, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &format);
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),
frameFlipped(false),
textureIdList(),
textureList(),
textureCount(0),
textureRows(0),
textureCols(0)
{ }
/// @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 VideoOutInitException(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
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, bool flipped) {
// Do nothing if the frame size and format are unchanged
if (width == frameWidth && height == frameHeight && format == frameFormat && flipped == frameFlipped) return;
frameWidth = width;
frameHeight = height;
frameFormat = format;
frameFlipped = flipped;
wxLogDebug("VideoOutGL::InitTextures: Video size: %dx%d\n", width, height);
DetectOpenGLCapabilities();
// Clean up old textures
if (textureIdList.size() > 0) {
CHECK_INIT_ERROR(glDeleteTextures(textureIdList.size(), &textureIdList[0]));
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);
CHECK_INIT_ERROR(glGenTextures(textureIdList.size(), &textureIdList[0]));
// Calculate the position information for each texture
int sourceY = 0;
float destY = -1.0f;
for (int i = 0; i < textureRows; i++) {
int sourceX = 0;
float destX = -1.0f;
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.destX1 = destX;
ti.destY1 = destY;
ti.sourceH = sourceH;
ti.textureID = textureIdList[i * textureCols + j];
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);
CreateTexture(w, h, ti, format);
if (!supportsGlClampToEdge) {
// 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.destX2 = ti.destX1 + w * 2.0f / width;
ti.destY2 = ti.destY1 + h * 2.0f / height;
ti.texRight = 1.0f - ti.texLeft;
if (flipped) {
ti.texBottom = 1.0f - ti.texTop;
ti.dataOffset = sourceY * width * bpp + sourceX * bpp;
}
else {
ti.texBottom = ti.texTop - float(h - ti.sourceH) / h;
ti.texTop = 1.0f - ti.texTop - float(h - ti.sourceH) / h;
ti.dataOffset = (height - sourceY - ti.sourceH) * width * bpp + sourceX * bpp;
}
destX = ti.destX2;
sourceX += ti.sourceW;
}
destY += sourceH * 2.0f / height;
sourceY += sourceH;
}
}
void VideoOutGL::CreateTexture(int w, int h, const TextureInfo& ti, GLenum format) {
CHECK_INIT_ERROR(glBindTexture(GL_TEXTURE_2D, ti.textureID));
CHECK_INIT_ERROR(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);
CHECK_INIT_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
CHECK_INIT_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
GLint mode = supportsGlClampToEdge ? GL_CLAMP_TO_EDGE : GL_CLAMP;
CHECK_INIT_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, mode));
CHECK_INIT_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, mode));
}
void VideoOutGL::UploadFrameData(const AegiVideoFrame& frame) {
if (frame.h == 0 || frame.w == 0) return;
GLuint format = frame.invertChannels ? GL_BGRA_EXT : GL_RGBA;
InitTextures(frame.w, frame.h, format, frame.GetBpp(0), frame.flipped);
// Set the row length, needed to be able to upload partial rows
CHECK_ERROR(glPixelStorei(GL_UNPACK_ROW_LENGTH, frame.w));
for (unsigned i = 0; i < textureList.size(); i++) {
TextureInfo& ti = textureList[i];
CHECK_ERROR(glBindTexture(GL_TEXTURE_2D, ti.textureID));
CHECK_ERROR(glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, ti.sourceW,
ti.sourceH, format, GL_UNSIGNED_BYTE, frame.data[0] + ti.dataOffset));
}
CHECK_ERROR(glPixelStorei(GL_UNPACK_ROW_LENGTH, 0));
}
void VideoOutGL::SetViewport(int x, int y, int width, int height) {
CHECK_ERROR(glViewport(x, y, width, height));
}
void VideoOutGL::Render(int sw, int sh) {
// Clear the frame buffer
CHECK_ERROR(glClearColor(0,0,0,0));
CHECK_ERROR(glClearStencil(0));
CHECK_ERROR(glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT));
CHECK_ERROR(glShadeModel(GL_FLAT));
CHECK_ERROR(glDisable(GL_BLEND));
CHECK_ERROR(glMatrixMode(GL_PROJECTION));
CHECK_ERROR(glLoadIdentity());
// Render the current frame
CHECK_ERROR(glEnable(GL_TEXTURE_2D));
for (unsigned i = 0; i < textureList.size(); i++) {
TextureInfo& ti = textureList[i];
CHECK_ERROR(glBindTexture(GL_TEXTURE_2D, ti.textureID));
CHECK_ERROR(glColor4f(1.0f, 1.0f, 1.0f, 1.0f));
glBegin(GL_QUADS);
glTexCoord2f(ti.texLeft, ti.texTop); glVertex2f(ti.destX1, ti.destY1);
glTexCoord2f(ti.texRight, ti.texTop); glVertex2f(ti.destX2, ti.destY1);
glTexCoord2f(ti.texRight, ti.texBottom); glVertex2f(ti.destX2, ti.destY2);
glTexCoord2f(ti.texLeft, ti.texBottom); glVertex2f(ti.destX1, ti.destY2);
glEnd();
if (GLenum err = glGetError()) throw VideoOutRenderException(L"GL_QUADS", err);
}
CHECK_ERROR(glDisable(GL_TEXTURE_2D));
CHECK_ERROR(glOrtho(0.0f, sw, sh, 0.0f, -1000.0f, 1000.0f));
CHECK_ERROR(glMatrixMode(GL_MODELVIEW));
CHECK_ERROR(glLoadIdentity());
}
VideoOutGL::~VideoOutGL() {
if (textureIdList.size() > 0) {
glDeleteTextures(textureIdList.size(), &textureIdList[0]);
}
}