void ReadPixelsTest::getFormatInfo (tcu::TextureFormat& format, GLint& glFormat, GLint& glType, int& pixelSize)
{
if (m_chooseFormat)
{
GLU_CHECK_CALL(glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &glFormat));
GLU_CHECK_CALL(glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &glType));
if (glFormat != GL_RGBA && glFormat != GL_BGRA && glFormat != GL_RGB)
TCU_THROW(NotSupportedError, ("Unsupported IMPLEMENTATION_COLOR_READ_FORMAT: " + de::toString(glu::getPixelFormatStr(glFormat))).c_str());
if (glu::getTypeName(glType) == DE_NULL)
TCU_THROW(NotSupportedError, ("Unsupported GL_IMPLEMENTATION_COLOR_READ_TYPE: " + de::toString(tcu::Format::Hex<4>(glType))).c_str());
format = glu::mapGLTransferFormat(glFormat, glType);
pixelSize = format.getPixelSize();
}
else
{
format = tcu::TextureFormat(tcu::TextureFormat::RGBA, tcu::TextureFormat::UNORM_INT8);
pixelSize = 1 * 4;
glFormat = GL_RGBA;
glType = GL_UNSIGNED_BYTE;
}
}
GLW_APICALL void GLW_APIENTRY glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid* pixels)
{
DE_UNREF(x);
DE_UNREF(y);
Context* const ctx = getCurrentContext();
const tcu::Vec4 clearColor (0.0f, 0.0f, 0.0f, 1.0f); // black
const tcu::TextureFormat transferFormat = glu::mapGLTransferFormat(format, type);
// invalid formats
if (transferFormat.order == TextureFormat::CHANNELORDER_LAST || transferFormat.type == TextureFormat::CHANNELTYPE_LAST)
{
if (ctx->lastError == GL_NO_ERROR)
ctx->lastError = GL_INVALID_ENUM;
return;
}
// unsupported formats
if (!(format == GL_RGBA && type == GL_UNSIGNED_BYTE) &&
!(format == GL_RGBA_INTEGER && type == GL_INT) &&
!(format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT) &&
!(format == GL_RGBA && type == GL_FLOAT))
{
if (ctx->lastError == GL_NO_ERROR)
ctx->lastError = GL_INVALID_ENUM;
return;
}
// invalid arguments
if (width < 0 || height < 0)
{
if (ctx->lastError == GL_NO_ERROR)
ctx->lastError = GL_INVALID_OPERATION;
return;
}
// read to buffer
if (ctx->pixelPackBufferBufferBinding)
return;
// read to use pointer
{
const int targetRowLength = (ctx->pixelPackRowLength != 0) ? (ctx->pixelPackRowLength) : (width);
const int targetSkipRows = ctx->pixelPackSkipRows;
const int targetSkipPixels = ctx->pixelPackSkipPixels;
const int infiniteHeight = targetSkipRows + height; // as much as needed
const int targetRowPitch = (ctx->pixelPackAlignment == 0) ? (targetRowLength * transferFormat.getPixelSize()) : (deAlign32(targetRowLength * transferFormat.getPixelSize(), ctx->pixelPackAlignment));
// Create access to the whole copy target
const tcu::PixelBufferAccess targetAccess (transferFormat, targetRowLength, infiniteHeight, 1, targetRowPitch, 0, pixels);
// Select (skip_pixels, skip_rows, width, height) subregion from it. Clip to horizontal boundaries
const tcu::PixelBufferAccess targetRectAccess = tcu::getSubregion(targetAccess,
de::clamp(targetSkipPixels, 0, targetAccess.getWidth()-1),
targetSkipRows,
de::clamp(width, 0, de::max(0, targetAccess.getWidth() - targetSkipPixels)),
height);
tcu::clear(targetRectAccess, clearColor);
}
}