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DVGOglEffectSketch.m
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DVGOglEffectSketch.m
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#import "DVGOglEffectSketch.h"
static int ddLogLevel = LOG_LEVEL_VERBOSE;
enum
{
UNIFORM_OGL_THRESH,
UNIFORM_OGL_TEXW,
UNIFORM_OGL_TEXH
};
static NSString* kEffectVertexShader = SHADER_STRING
(
attribute vec4 position;
attribute vec4 inputTextureCoordinate;
uniform float texelWidth;
uniform float texelHeight;
varying vec2 textureCoordinate;
varying vec2 leftTextureCoordinate;
varying vec2 rightTextureCoordinate;
varying vec2 topTextureCoordinate;
varying vec2 topLeftTextureCoordinate;
varying vec2 topRightTextureCoordinate;
varying vec2 bottomTextureCoordinate;
varying vec2 bottomLeftTextureCoordinate;
varying vec2 bottomRightTextureCoordinate;
void main()
{
gl_Position = position;
vec2 widthStep = vec2(texelWidth, 0.0);
vec2 heightStep = vec2(0.0, texelHeight);
vec2 widthHeightStep = vec2(texelWidth, texelHeight);
vec2 widthNegativeHeightStep = vec2(texelWidth, -texelHeight);
textureCoordinate = inputTextureCoordinate.xy;
leftTextureCoordinate = inputTextureCoordinate.xy - widthStep;
rightTextureCoordinate = inputTextureCoordinate.xy + widthStep;
topTextureCoordinate = inputTextureCoordinate.xy - heightStep;
topLeftTextureCoordinate = inputTextureCoordinate.xy - widthHeightStep;
topRightTextureCoordinate = inputTextureCoordinate.xy + widthNegativeHeightStep;
bottomTextureCoordinate = inputTextureCoordinate.xy + heightStep;
bottomLeftTextureCoordinate = inputTextureCoordinate.xy - widthNegativeHeightStep;
bottomRightTextureCoordinate = inputTextureCoordinate.xy + widthHeightStep;
}
);
static NSString* kEffectFragmentShader = SHADER_STRING
(
precision highp float;
varying vec2 textureCoordinate;
varying vec2 leftTextureCoordinate;
varying vec2 rightTextureCoordinate;
varying vec2 topTextureCoordinate;
varying vec2 topLeftTextureCoordinate;
varying vec2 topRightTextureCoordinate;
varying vec2 bottomTextureCoordinate;
varying vec2 bottomLeftTextureCoordinate;
varying vec2 bottomRightTextureCoordinate;
uniform sampler2D inputImageTexture;
uniform highp float threshold;
void main()
{
float bottomLeftIntensity = texture2D(inputImageTexture, bottomLeftTextureCoordinate).r;
float topRightIntensity = texture2D(inputImageTexture, topRightTextureCoordinate).r;
float topLeftIntensity = texture2D(inputImageTexture, topLeftTextureCoordinate).r;
float bottomRightIntensity = texture2D(inputImageTexture, bottomRightTextureCoordinate).r;
float leftIntensity = texture2D(inputImageTexture, leftTextureCoordinate).r;
float rightIntensity = texture2D(inputImageTexture, rightTextureCoordinate).r;
float bottomIntensity = texture2D(inputImageTexture, bottomTextureCoordinate).r;
float topIntensity = texture2D(inputImageTexture, topTextureCoordinate).r;
float h = -topLeftIntensity - 2.0 * topIntensity - topRightIntensity + bottomLeftIntensity + 2.0 * bottomIntensity + bottomRightIntensity;
float v = -bottomLeftIntensity - 2.0 * leftIntensity - topLeftIntensity + bottomRightIntensity + 2.0 * rightIntensity + topRightIntensity;
float mag = 1.0 - (length(vec2(h, v)) * threshold);
gl_FragColor = vec4(vec3(mag), 1.0);
}
);
@interface DVGOglEffectSketch ()
{
}
@end
@implementation DVGOglEffectSketch
- (id)init
{
self = [super init];
if(self) {
self.threshold = 1.0;
self.texelWidth = -1;
self.texelHeight = -1;
}
return self;
}
-(void)prepareOglResources
{
[super prepareOglResources];
[self prepareVertexShader:kEffectVertexShader withFragmentShader:kEffectFragmentShader
withAttribs:@[
@[@(ATTRIB_VERTEX_RPL), @"position"],
@[@(ATTRIB_TEXCOORD_RPL), @"inputTextureCoordinate"]
]
withUniforms:@[
@[@(UNIFORM_RENDER_TRANSFORM_RPL), @"renderTransform"],
@[@(UNIFORM_SHADER_SAMPLER_RPL), @"inputImageTexture"],
@[@(UNIFORM_OGL_THRESH), @"threshold"],
@[@(UNIFORM_OGL_TEXW), @"texelWidth"],
@[@(UNIFORM_OGL_TEXH), @"texelHeight"]
]
];
}
-(void)releaseOglResources
{
[super releaseOglResources];
}
- (void)setupFilterForSize:(CGSize)filterFrameSize
{
if(self.texelWidth <= 0){
self.texelWidth = 1.0 / filterFrameSize.width;
}
if(self.texelHeight <= 0){
self.texelHeight = 1.0 / filterFrameSize.height;
}
}
- (void)renderIntoPixelBuffer:(CVPixelBufferRef)destBuffer
prevBuffer:(CVPixelBufferRef)prevBuffer
trackBuffer:(CVPixelBufferRef)trackBuffer
trackOrient:(DVGGLRotationMode)trackOrientation
atTime:(CGFloat)time withTween:(float)tweenFactor
{
CGFloat vport_w = CVPixelBufferGetWidth(destBuffer);
CGFloat vport_h = CVPixelBufferGetHeight(destBuffer);
[self setupFilterForSize:CGSizeMake(vport_w, vport_h)];
[self prepareContextForRendering];
if(prevBuffer != nil){
trackBuffer = prevBuffer;
trackOrientation = kDVGGLNoRotation;
}
CVOpenGLESTextureRef trckBGRATexture = [self bgraTextureForPixelBuffer:trackBuffer];
CVOpenGLESTextureRef destBGRATexture = [self bgraTextureForPixelBuffer:destBuffer];
// Attach the destination texture as a color attachment to the off screen frame buffer
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, CVOpenGLESTextureGetTarget(destBGRATexture), CVOpenGLESTextureGetName(destBGRATexture), 0);
glViewport(0, 0, (int)vport_w, (int)vport_h);
glActiveTexture(GL_TEXTURE0);
glBindTexture(CVOpenGLESTextureGetTarget(trckBGRATexture), CVOpenGLESTextureGetName(trckBGRATexture));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
goto bail;
}
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
static const GLfloat backgroundVertices[] = {
-1.0f, -1.0f,
1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, 1.0f,
};
[self activateContextShader:1];
glUniform1i([self getActiveShaderUniform:UNIFORM_SHADER_SAMPLER_RPL], 0);
glVertexAttribPointer(ATTRIB_VERTEX_RPL, 2, GL_FLOAT, 0, 0, backgroundVertices);
glEnableVertexAttribArray(ATTRIB_VERTEX_RPL);
glVertexAttribPointer(ATTRIB_TEXCOORD_RPL, 2, GL_FLOAT, 0, 0, [DVGOglEffectBase textureCoordinatesForRotation:trackOrientation]);
glEnableVertexAttribArray(ATTRIB_TEXCOORD_RPL);
// Draw the background frame
glUniform1f([self getActiveShaderUniform:UNIFORM_OGL_THRESH], self.threshold);
glUniform1f([self getActiveShaderUniform:UNIFORM_OGL_TEXW], self.texelWidth);
glUniform1f([self getActiveShaderUniform:UNIFORM_OGL_TEXH], self.texelHeight);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glFlush();
bail:
if(trckBGRATexture){
CFRelease(trckBGRATexture);
}
if(destBGRATexture){
CFRelease(destBGRATexture);
}
[self releaseContextForRendering];
}
@end