VuoImageRenderer.cc

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#include "VuoImageRenderer.h"
 
 
#include <IOSurface/IOSurface.h>
 
#include <OpenGL/CGLMacro.h>
#define glGenVertexArrays glGenVertexArraysAPPLE
#define glBindVertexArray glBindVertexArrayAPPLE
#define glDeleteVertexArrays glDeleteVertexArraysAPPLE
 
#include "module.h"
extern "C"
{
#ifdef VUO_COMPILER
VuoModuleMetadata({
                     "title" : "VuoImageRenderer",
                     "dependencies" : [
                         "VuoImage",
                         "VuoImageColorDepth",
                         "VuoShader",
                         "VuoGlContext",
                         "VuoGlPool",
                         "OpenGL.framework"
                     ]
                 });
#endif
}
 
struct VuoImageRendererInternal
{
    GLuint outputFramebuffer;
 
    GLuint vertexArray;
    GLuint quadDataBuffer;
};
static VuoImageRendererInternal VuoImageRendererGlobal;
 
static const GLfloat quadData[] = {
    // Positions
    -1, -1, 0, 1,
     1, -1, 0, 1,
    -1,  1, 0, 1,
     1,  1, 0, 1,
 
    // Texture Coordinates
    0, 0, 0, 0,
    1, 0, 0, 0,
    0, 1, 0, 0,
    1, 1, 0, 0
};
static const GLfloat unityMatrix[16] = {
    1,0,0,0,
    0,1,0,0,
    0,0,1,0,
    0,0,0,1
};
 
static void VuoImageRenderer_fini(void);
 
static void VuoImageRenderer_init(void)
{
    static dispatch_once_t once = 0;
    dispatch_once(&once, ^{
        VuoGlContext_perform(^(CGLContextObj cgl_ctx){
            glGenVertexArrays(1, &VuoImageRendererGlobal.vertexArray);
            glBindVertexArray(VuoImageRendererGlobal.vertexArray);
            {
                VuoImageRendererGlobal.quadDataBuffer = VuoGlPool_use(cgl_ctx, VuoGlPool_ArrayBuffer, sizeof(quadData));
                VuoGlPool_retain(VuoImageRendererGlobal.quadDataBuffer);
                glBindBuffer(GL_ARRAY_BUFFER, VuoImageRendererGlobal.quadDataBuffer);
                glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(quadData), quadData);
            }
            glBindVertexArray(0);
 
            glFlushRenderAPPLE();
 
            glGenFramebuffers(1, &VuoImageRendererGlobal.outputFramebuffer);
        });
 
        VuoAddCompositionFiniCallback(VuoImageRenderer_fini);
    });
}
 
extern "C" VuoImage VuoImageRenderer_draw(void *ir, VuoShader shader, unsigned int pixelsWide, unsigned int pixelsHigh, VuoImageColorDepth imageColorDepth)
{
    return VuoImageRenderer_render(shader, pixelsWide, pixelsHigh, imageColorDepth);
}
 
extern "C" void *VuoImageRenderer_make(void *)
{
    return NULL;
}
 
VuoImage VuoImageRenderer_render(VuoShader shader, unsigned int pixelsWide, unsigned int pixelsHigh, VuoImageColorDepth imageColorDepth)
{
    if (pixelsWide < 1 || pixelsHigh < 1)
        return NULL;
 
    GLuint internalFormat;
    GLuint outputTexture = VuoImageRenderer_draw_internal(shader, pixelsWide, pixelsHigh, imageColorDepth, false, false, 0, &internalFormat);
    if (!outputTexture)
        return NULL;
 
    return VuoImage_make(outputTexture, internalFormat, pixelsWide, pixelsHigh);
}
 
unsigned long int VuoImageRenderer_draw_internal(VuoShader shader, unsigned int pixelsWide, unsigned int pixelsHigh, VuoImageColorDepth imageColorDepth, bool outputToIOSurface, bool outputToGlTextureRectangle, unsigned int outputToSpecificTexture, GLuint *outputInternalFormat)
{
    VuoImageRenderer_init();
 
    __block GLuint outputTexture = 0;
    __block IOSurfaceID surfID = 0;
    VuoGlContext_perform(^(CGLContextObj cgl_ctx){
        glViewport(0, 0, pixelsWide, pixelsHigh);
 
        // Create a new GL Texture Object.
        GLenum textureFormat = VuoShader_isOpaque(shader) ? GL_BGR : GL_BGRA;
        GLuint textureTarget = (outputToIOSurface || outputToGlTextureRectangle) ? GL_TEXTURE_RECTANGLE_ARB : GL_TEXTURE_2D;
        GLuint textureTargetInternalFormat = VuoImageColorDepth_getGlInternalFormat(textureFormat, imageColorDepth);
        if (outputInternalFormat)
            *outputInternalFormat = textureTargetInternalFormat;
 
        VuoIoSurface ioSurface = NULL;
        if (outputToIOSurface)
            ioSurface = VuoIoSurfacePool_use(cgl_ctx, pixelsWide, pixelsHigh, &outputTexture);
        else if (outputToSpecificTexture)
            outputTexture = outputToSpecificTexture;
        else
            outputTexture = VuoGlTexturePool_use(cgl_ctx, VuoGlTexturePool_Allocate, outputToGlTextureRectangle ? GL_TEXTURE_RECTANGLE_ARB : GL_TEXTURE_2D, textureTargetInternalFormat, pixelsWide, pixelsHigh, textureFormat, NULL);
 
        if (!outputTexture)
            return;
 
        glBindFramebuffer(GL_FRAMEBUFFER, VuoImageRendererGlobal.outputFramebuffer);
//      VLog("glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, %s, %d, 0);", VuoGl_stringForConstant(textureTarget), outputTexture);
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, textureTarget, outputTexture, 0);
 
        glClearColor(0,0,0,0);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
        // Execute the shader.
        {
            GLint positionAttribute;
            GLint textureCoordinateAttribute;
            bool ret = VuoShader_getAttributeLocations(shader, VuoMesh_IndividualTriangles, cgl_ctx, &positionAttribute, NULL, NULL, NULL, &textureCoordinateAttribute);
            if (!ret)
            {
                VDebugLog("Error: Failed to get attribute locations.");
                glBindFramebuffer(GL_FRAMEBUFFER, 0);
                if (outputToIOSurface)
                    VuoIoSurfacePool_disuse(ioSurface, false);  // It was never used, so no need to quarantine it.
                else if (outputToSpecificTexture)
                {}
                else
                {
                    VuoGlTexture_retain(outputTexture, NULL, NULL);
                    VuoGlTexture_release(VuoGlTexturePool_Allocate, outputToGlTextureRectangle ? GL_TEXTURE_RECTANGLE_ARB : GL_TEXTURE_2D, textureTargetInternalFormat, pixelsWide, pixelsHigh, outputTexture);
                }
                outputTexture = 0;
                surfID = 0;
                return;
            }
 
            VuoGlProgram program;
            if (!VuoShader_activate(shader, VuoMesh_IndividualTriangles, cgl_ctx, &program))
            {
                VUserLog("Shader activation failed.");
                outputTexture = 0;
                surfID = 0;
                return;
            }
 
            {
                glBindVertexArray(VuoImageRendererGlobal.vertexArray);
 
                GLint projectionMatrixUniform = VuoGlProgram_getUniformLocation(program, "projectionMatrix");
                glUniformMatrix4fv(projectionMatrixUniform, 1, GL_FALSE, unityMatrix);
 
                GLint cameraMatrixInverseUniform = VuoGlProgram_getUniformLocation(program, "cameraMatrixInverse");
                glUniformMatrix4fv(cameraMatrixInverseUniform, 1, GL_FALSE, unityMatrix);
 
                GLint useFisheyeProjectionUniform = VuoGlProgram_getUniformLocation(program, "useFisheyeProjection");
                glUniform1i(useFisheyeProjectionUniform, false);
 
                GLint modelviewMatrixUniform = VuoGlProgram_getUniformLocation(program, "modelviewMatrix");
                glUniformMatrix4fv(modelviewMatrixUniform, 1, GL_FALSE, unityMatrix);
 
                GLint aspectRatioUniform = VuoGlProgram_getUniformLocation(program, "aspectRatio");
                if (aspectRatioUniform != -1)
                    glUniform1f(aspectRatioUniform, (float)pixelsWide/(float)pixelsHigh);
 
                GLint viewportSizeUniform = VuoGlProgram_getUniformLocation(program, "viewportSize");
                if (viewportSizeUniform != -1)
                    glUniform2f(viewportSizeUniform, (float)pixelsWide, (float)pixelsHigh);
 
                glBindBuffer(GL_ARRAY_BUFFER, VuoImageRendererGlobal.quadDataBuffer);
 
                glEnableVertexAttribArray(positionAttribute);
                glVertexAttribPointer(positionAttribute, 4 /* XYZW */, GL_FLOAT, GL_FALSE, sizeof(GLfloat)*4, (void*)0);
 
                if (textureCoordinateAttribute != -1)
                {
                    glEnableVertexAttribArray(textureCoordinateAttribute);
                    glVertexAttribPointer(textureCoordinateAttribute, 4 /* XYZW */, GL_FLOAT, GL_FALSE, sizeof(GLfloat)*4, (void*)(sizeof(GLfloat)*16));
                }
 
#ifdef VUO_PROFILE
    GLuint timeElapsedQuery;
    glGenQueries(1, &timeElapsedQuery);
    glBeginQuery(GL_TIME_ELAPSED_EXT, timeElapsedQuery);
#endif
 
                glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 
#ifdef VUO_PROFILE
    double seconds;
    glEndQuery(GL_TIME_ELAPSED_EXT);
    GLuint nanoseconds;
    glGetQueryObjectuiv(timeElapsedQuery, GL_QUERY_RESULT, &nanoseconds);
    seconds = ((double)nanoseconds) / NSEC_PER_SEC;
    glDeleteQueries(1, &timeElapsedQuery);
 
    double objectPercent = seconds / (1./60.) * 100.;
    VLog("%6.2f %% of 60 Hz frame   %s", objectPercent, shader->name);
#endif
 
                if (textureCoordinateAttribute != -1)
                glDisableVertexAttribArray(textureCoordinateAttribute);
 
                glDisableVertexAttribArray(positionAttribute);
 
                glBindBuffer(GL_ARRAY_BUFFER, 0);
                glBindVertexArray(0);
            }
            VuoShader_deactivate(shader, VuoMesh_IndividualTriangles, cgl_ctx);
        }
 
        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, textureTarget, 0, 0);
        glBindFramebuffer(GL_FRAMEBUFFER, 0);
 
        if (outputToIOSurface)
        {
            surfID = VuoIoSurfacePool_getId(ioSurface);
            VuoIoSurfacePool_disuse(ioSurface, true);  // We may be sending it to another process, so we need to quarantine it.
        }
 
        glFlushRenderAPPLE();
    });
 
    if (outputToIOSurface)
        return surfID;
    else
        return outputTexture;
}
 
static void VuoImageRenderer_fini(void)
{
    VuoGlContext_perform(^(CGLContextObj cgl_ctx){
        glBindBuffer(GL_ARRAY_BUFFER, 0);
 
        VuoGlPool_release(VuoGlPool_ArrayBuffer, sizeof(quadData), VuoImageRendererGlobal.quadDataBuffer);
 
        glDeleteVertexArrays(1, &VuoImageRendererGlobal.vertexArray);
        glDeleteFramebuffers(1, &VuoImageRendererGlobal.outputFramebuffer);
    });
}